diff --git a/Signal/src/AppDelegate.m b/Signal/src/AppDelegate.m
index 11a676fdd..84500eefb 100644
--- a/Signal/src/AppDelegate.m
+++ b/Signal/src/AppDelegate.m
@@ -28,7 +28,6 @@
 #import <SignalMessaging/OWSNavigationController.h>
 #import <SignalMessaging/OWSPreferences.h>
 #import <SignalMessaging/OWSProfileManager.h>
-#import <SignalMessaging/OWSSyncManager.h>
 #import <SignalMessaging/SignalMessaging.h>
 #import <SignalMessaging/VersionMigrations.h>
 #import <SignalServiceKit/AppReadiness.h>
@@ -193,9 +192,6 @@ static NSTimeInterval launchStartedAt;
                                      screenBlockingWindow:OWSScreenLockUI.sharedManager.screenBlockingWindow];
     [OWSScreenLockUI.sharedManager startObserving];
 
-    // Ensure OWSSyncManager is instantiated.
-    [OWSSyncManager shared];
-
     [[NSNotificationCenter defaultCenter] addObserver:self
                                              selector:@selector(storageIsReady)
                                                  name:StorageIsReadyNotification
diff --git a/Signal/src/ViewControllers/DebugUI/DebugUISyncMessages.m b/Signal/src/ViewControllers/DebugUI/DebugUISyncMessages.m
index 405cfed90..1e02461ea 100644
--- a/Signal/src/ViewControllers/DebugUI/DebugUISyncMessages.m
+++ b/Signal/src/ViewControllers/DebugUI/DebugUISyncMessages.m
@@ -17,7 +17,6 @@
 #import <SignalServiceKit/OWSPrimaryStorage+SessionStore.h>
 #import <SignalServiceKit/OWSPrimaryStorage.h>
 #import <SignalServiceKit/OWSReadReceiptManager.h>
-#import <SignalServiceKit/OWSSyncConfigurationMessage.h>
 #import <SignalServiceKit/OWSSyncContactsMessage.h>
 #import <SignalServiceKit/OWSSyncGroupsMessage.h>
 #import <SignalServiceKit/OWSSyncGroupsRequestMessage.h>
@@ -142,8 +141,7 @@ NS_ASSUME_NONNULL_BEGIN
 
 + (void)sendConfigurationSyncMessage
 {
-    [NSNotificationCenter.defaultCenter postNotificationNameAsync:NSNotificationName_SyncConfigurationNeeded
-                                                           object:nil];
+    [SSKEnvironment.shared.syncManager sendConfigurationSyncMessage];
 }
 
 @end
diff --git a/Signal/test/mocks/MockEnvironment.h b/Signal/test/mocks/MockEnvironment.h
index cbb121adb..7fb59f801 100644
--- a/Signal/test/mocks/MockEnvironment.h
+++ b/Signal/test/mocks/MockEnvironment.h
@@ -14,7 +14,6 @@ NS_ASSUME_NONNULL_BEGIN
 
 @property (nonatomic) OWSContactsManager *contactsManager;
 @property (nonatomic) OWSPreferences *preferences;
-@property (nonatomic) OWSSyncManager *syncManager;
 @property (nonatomic) OWSSounds *sounds;
 @property (nonatomic) LockInteractionController *lockInteractionController;
 @property (nonatomic) OWSWindowManager *windowManager;
diff --git a/Signal/test/mocks/MockEnvironment.m b/Signal/test/mocks/MockEnvironment.m
index 99ef2ba07..97dd723a4 100644
--- a/Signal/test/mocks/MockEnvironment.m
+++ b/Signal/test/mocks/MockEnvironment.m
@@ -4,7 +4,6 @@
 
 #import "MockEnvironment.h"
 #import "OWSBackup.h"
-#import "OWSSyncManager.h"
 #import "OWSWindowManager.h"
 #import <SignalMessaging/LockInteractionController.h>
 #import <SignalMessaging/OWSPreferences.h>
@@ -28,13 +27,11 @@ NS_ASSUME_NONNULL_BEGIN
 
     // TODO: We should probably mock this out.
     OWSPreferences *preferences = [OWSPreferences new];
-    OWSSyncManager *syncManager = [[OWSSyncManager alloc] initDefault];
     OWSSounds *sounds = [[OWSSounds alloc] initWithPrimaryStorage:primaryStorage];
     LockInteractionController *lockInteractionController = [[LockInteractionController alloc] initDefault];
     OWSWindowManager *windowManager = [[OWSWindowManager alloc] initDefault];
 
     self = [super initWithPreferences:preferences
-                          syncManager:syncManager
                                sounds:sounds
             lockInteractionController:lockInteractionController
                         windowManager:windowManager];
diff --git a/SignalMessaging/contacts/OWSSyncManager.h b/SignalMessaging/contacts/OWSSyncManager.h
index 4fbba73de..7e30be498 100644
--- a/SignalMessaging/contacts/OWSSyncManager.h
+++ b/SignalMessaging/contacts/OWSSyncManager.h
@@ -2,6 +2,8 @@
 //  Copyright (c) 2018 Open Whisper Systems. All rights reserved.
 //
 
+#import <SignalServiceKit/OWSSyncManagerProtocol.h>
+
 NS_ASSUME_NONNULL_BEGIN
 
 @class OWSContactsManager;
@@ -9,7 +11,7 @@ NS_ASSUME_NONNULL_BEGIN
 @class OWSMessageSender;
 @class OWSProfileManager;
 
-@interface OWSSyncManager : NSObject
+@interface OWSSyncManager : NSObject <OWSSyncManagerProtocol>
 
 - (instancetype)init NS_UNAVAILABLE;
 
diff --git a/SignalMessaging/contacts/OWSSyncManager.m b/SignalMessaging/contacts/OWSSyncManager.m
index ab4bf8998..ac60e9c55 100644
--- a/SignalMessaging/contacts/OWSSyncManager.m
+++ b/SignalMessaging/contacts/OWSSyncManager.m
@@ -8,12 +8,14 @@
 #import "OWSPreferences.h"
 #import "OWSProfileManager.h"
 #import "OWSReadReceiptManager.h"
+#import <SignalServiceKit/AppReadiness.h>
 #import <SignalServiceKit/DataSource.h>
 #import <SignalServiceKit/MIMETypeUtil.h>
 #import <SignalServiceKit/OWSMessageSender.h>
 #import <SignalServiceKit/OWSPrimaryStorage.h>
 #import <SignalServiceKit/OWSSyncConfigurationMessage.h>
 #import <SignalServiceKit/OWSSyncContactsMessage.h>
+#import <SignalServiceKit/SSKEnvironment.h>
 #import <SignalServiceKit/TSAccountManager.h>
 #import <SignalServiceKit/YapDatabaseConnection+OWS.h>
 
@@ -33,9 +35,9 @@ NSString *const kOWSPrimaryStorageOWSSyncManagerLastMessageKey = @"kTSStorageMan
 @implementation OWSSyncManager
 
 + (instancetype)shared {
-    OWSAssertDebug(Environment.shared.syncManager);
+    OWSAssertDebug(SSKEnvironment.shared.syncManager);
 
-    return Environment.shared.syncManager;
+    return SSKEnvironment.shared.syncManager;
 }
 
 - (instancetype)initDefault {
@@ -55,10 +57,6 @@ NSString *const kOWSPrimaryStorageOWSSyncManagerLastMessageKey = @"kTSStorageMan
                                              selector:@selector(profileKeyDidChange:)
                                                  name:kNSNotificationName_ProfileKeyDidChange
                                                object:nil];
-    [[NSNotificationCenter defaultCenter] addObserver:self
-                                             selector:@selector(syncConfigurationNeeded:)
-                                                 name:NSNotificationName_SyncConfigurationNeeded
-                                               object:nil];
 
     return self;
 }
@@ -107,12 +105,6 @@ NSString *const kOWSPrimaryStorageOWSSyncManagerLastMessageKey = @"kTSStorageMan
     [self sendSyncContactsMessageIfPossible];
 }
 
-- (void)syncConfigurationNeeded:(id)notification {
-    OWSAssertIsOnMainThread();
-
-    [self sendConfigurationSyncMessage];
-}
-
 #pragma mark -
 
 - (YapDatabaseConnection *)editingDatabaseConnection {
@@ -200,6 +192,12 @@ NSString *const kOWSPrimaryStorageOWSSyncManagerLastMessageKey = @"kTSStorageMan
 }
 
 - (void)sendConfigurationSyncMessage {
+    [AppReadiness runNowOrWhenAppIsReady:^{
+        [self sendConfigurationSyncMessage_AppReady];
+    }];
+}
+
+- (void)sendConfigurationSyncMessage_AppReady {
     DDLogInfo(@"");
 
     BOOL areReadReceiptsEnabled = SSKEnvironment.shared.readReceiptManager.areReadReceiptsEnabled;
diff --git a/SignalMessaging/environment/AppSetup.m b/SignalMessaging/environment/AppSetup.m
index 9106a8d2d..85f476cbe 100644
--- a/SignalMessaging/environment/AppSetup.m
+++ b/SignalMessaging/environment/AppSetup.m
@@ -88,7 +88,6 @@ NS_ASSUME_NONNULL_BEGIN
         OWSWindowManager *windowManager = [[OWSWindowManager alloc] initDefault];
 
         [Environment setShared:[[Environment alloc] initWithPreferences:preferences
-                                                            syncManager:syncManager
                                                                  sounds:sounds
                                               lockInteractionController:lockInteractionController
                                                           windowManager:windowManager]];
@@ -111,8 +110,9 @@ NS_ASSUME_NONNULL_BEGIN
                                                                     ows2FAManager:ows2FAManager
                                                           disappearingMessagesJob:disappearingMessagesJob
                                                           contactDiscoveryService:contactDiscoveryService
-                                                          disappearingMessagesJob:readReceiptManager
-                                                          contactDiscoveryService:outgoingReceiptManager]];
+                                                               readReceiptManager:readReceiptManager
+                                                           outgoingReceiptManager:outgoingReceiptManager
+                                                                      syncManager:syncManager]];
 
         appSpecificSingletonBlock();
 
diff --git a/SignalMessaging/environment/Environment.h b/SignalMessaging/environment/Environment.h
index 231a360e8..0a854ab0b 100644
--- a/SignalMessaging/environment/Environment.h
+++ b/SignalMessaging/environment/Environment.h
@@ -8,7 +8,6 @@
 @class OWSContactsManager;
 @class OWSPreferences;
 @class OWSSounds;
-@class OWSSyncManager;
 @class OWSWindowManager;
 
 /**
@@ -24,14 +23,12 @@
 - (instancetype)init NS_UNAVAILABLE;
 
 - (instancetype)initWithPreferences:(OWSPreferences *)preferences
-                        syncManager:(OWSSyncManager *)syncManager
                              sounds:(OWSSounds *)sounds
           lockInteractionController:(LockInteractionController *)lockInteractionController
                       windowManager:(OWSWindowManager *)windowManager;
 
 @property (nonatomic, readonly) OWSContactsManager *contactsManager;
 @property (nonatomic, readonly) OWSPreferences *preferences;
-@property (nonatomic, readonly) OWSSyncManager *syncManager;
 @property (nonatomic, readonly) OWSSounds *sounds;
 @property (nonatomic, readonly) LockInteractionController *lockInteractionController;
 @property (nonatomic, readonly) OWSWindowManager *windowManager;
diff --git a/SignalMessaging/environment/Environment.m b/SignalMessaging/environment/Environment.m
index b75c59114..544b09267 100644
--- a/SignalMessaging/environment/Environment.m
+++ b/SignalMessaging/environment/Environment.m
@@ -13,7 +13,6 @@ static Environment *sharedEnvironment = nil;
 
 @property (nonatomic) OWSContactsManager *contactsManager;
 @property (nonatomic) OWSPreferences *preferences;
-@property (nonatomic) OWSSyncManager *syncManager;
 @property (nonatomic) OWSSounds *sounds;
 @property (nonatomic) LockInteractionController *lockInteractionController;
 @property (nonatomic) OWSWindowManager *windowManager;
@@ -49,7 +48,6 @@ static Environment *sharedEnvironment = nil;
 }
 
 - (instancetype)initWithPreferences:(OWSPreferences *)preferences
-                        syncManager:(OWSSyncManager *)syncManager
                              sounds:(OWSSounds *)sounds
           lockInteractionController:(LockInteractionController *)lockInteractionController
                       windowManager:(OWSWindowManager *)windowManager {
@@ -59,13 +57,11 @@ static Environment *sharedEnvironment = nil;
     }
 
     OWSAssertDebug(preferences);
-    OWSAssertDebug(syncManager);
     OWSAssertDebug(sounds);
     OWSAssertDebug(lockInteractionController);
     OWSAssertDebug(windowManager);
 
     _preferences = preferences;
-    _syncManager = syncManager;
     _sounds = sounds;
     _lockInteractionController = lockInteractionController;
     _windowManager = windowManager;
diff --git a/SignalMessaging/utils/OWSPreferences.m b/SignalMessaging/utils/OWSPreferences.m
index c7eb41c2e..56d736f28 100644
--- a/SignalMessaging/utils/OWSPreferences.m
+++ b/SignalMessaging/utils/OWSPreferences.m
@@ -6,7 +6,8 @@
 #import <SignalServiceKit/AppContext.h>
 #import <SignalServiceKit/NSNotificationCenter+OWS.h>
 #import <SignalServiceKit/NSUserDefaults+OWS.h>
-#import <SignalServiceKit/OWSSyncConfigurationMessage.h>
+#import <SignalServiceKit/OWSSyncManagerProtocol.h>
+#import <SignalServiceKit/SSKEnvironment.h>
 #import <SignalServiceKit/TSStorageHeaders.h>
 #import <SignalServiceKit/YapDatabaseConnection+OWS.h>
 #import <SignalServiceKit/YapDatabaseTransaction+OWS.h>
@@ -201,8 +202,7 @@ NSString *const OWSPreferencesKeySystemCallLogEnabled = @"OWSPreferencesKeySyste
 {
     [self setValueForKey:OWSPreferencesKeyShouldShowUnidentifiedDeliveryIndicators toValue:@(value)];
 
-    [NSNotificationCenter.defaultCenter postNotificationNameAsync:NSNotificationName_SyncConfigurationNeeded
-                                                           object:nil];
+    [SSKEnvironment.shared.syncManager sendConfigurationSyncMessage];
 }
 
 #pragma mark - Calling
diff --git a/SignalServiceKit/src/Messages/DeviceSyncing/OWSSyncConfigurationMessage.h b/SignalServiceKit/src/Messages/DeviceSyncing/OWSSyncConfigurationMessage.h
index 5482c3339..8cf32a566 100644
--- a/SignalServiceKit/src/Messages/DeviceSyncing/OWSSyncConfigurationMessage.h
+++ b/SignalServiceKit/src/Messages/DeviceSyncing/OWSSyncConfigurationMessage.h
@@ -6,8 +6,6 @@
 
 NS_ASSUME_NONNULL_BEGIN
 
-extern NSString *const NSNotificationName_SyncConfigurationNeeded;
-
 @interface OWSSyncConfigurationMessage : OWSOutgoingSyncMessage
 
 - (instancetype)init NS_UNAVAILABLE;
diff --git a/SignalServiceKit/src/Messages/DeviceSyncing/OWSSyncConfigurationMessage.m b/SignalServiceKit/src/Messages/DeviceSyncing/OWSSyncConfigurationMessage.m
index 33576c962..b92e6522d 100644
--- a/SignalServiceKit/src/Messages/DeviceSyncing/OWSSyncConfigurationMessage.m
+++ b/SignalServiceKit/src/Messages/DeviceSyncing/OWSSyncConfigurationMessage.m
@@ -7,8 +7,6 @@
 
 NS_ASSUME_NONNULL_BEGIN
 
-NSString *const NSNotificationName_SyncConfigurationNeeded = @"NSNotificationName_SyncConfigurationNeeded";
-
 @interface OWSSyncConfigurationMessage ()
 
 @property (nonatomic, readonly) BOOL areReadReceiptsEnabled;
diff --git a/SignalServiceKit/src/Messages/OWSMessageManager.m b/SignalServiceKit/src/Messages/OWSMessageManager.m
index cb9d032c0..27f30e68e 100644
--- a/SignalServiceKit/src/Messages/OWSMessageManager.m
+++ b/SignalServiceKit/src/Messages/OWSMessageManager.m
@@ -27,7 +27,6 @@
 #import "OWSPrimaryStorage.h"
 #import "OWSReadReceiptManager.h"
 #import "OWSRecordTranscriptJob.h"
-#import "OWSSyncConfigurationMessage.h"
 #import "OWSSyncContactsMessage.h"
 #import "OWSSyncGroupsMessage.h"
 #import "OWSSyncGroupsRequestMessage.h"
@@ -849,8 +848,7 @@ NS_ASSUME_NONNULL_BEGIN
             OWSLogInfo(@"Received request for block list");
             [self.blockingManager syncBlockList];
         } else if (syncMessage.request.type == SSKProtoSyncMessageRequestTypeConfiguration) {
-            [NSNotificationCenter.defaultCenter postNotificationNameAsync:NSNotificationName_SyncConfigurationNeeded
-                                                                   object:nil];
+            [SSKEnvironment.shared.syncManager sendConfigurationSyncMessage];
         } else {
             OWSLogWarn(@"ignoring unsupported sync request message");
         }
diff --git a/SignalServiceKit/src/Messages/OWSReadReceiptManager.m b/SignalServiceKit/src/Messages/OWSReadReceiptManager.m
index d8625396f..f64ebd4a9 100644
--- a/SignalServiceKit/src/Messages/OWSReadReceiptManager.m
+++ b/SignalServiceKit/src/Messages/OWSReadReceiptManager.m
@@ -4,7 +4,6 @@
 
 #import "OWSReadReceiptManager.h"
 #import "AppReadiness.h"
-#import "NSNotificationCenter+OWS.h"
 #import "OWSLinkedDeviceReadReceipt.h"
 #import "OWSMessageSender.h"
 #import "OWSOutgoingReceiptManager.h"
@@ -12,7 +11,6 @@
 #import "OWSReadReceiptsForLinkedDevicesMessage.h"
 #import "OWSReceiptsForSenderMessage.h"
 #import "OWSStorage.h"
-#import "OWSSyncConfigurationMessage.h"
 #import "SSKEnvironment.h"
 #import "TSAccountManager.h"
 #import "TSContactThread.h"
@@ -571,8 +569,7 @@ NSString *const OWSReadReceiptManagerAreReadReceiptsEnabled = @"areReadReceiptsE
                         forKey:OWSReadReceiptManagerAreReadReceiptsEnabled
                   inCollection:OWSReadReceiptManagerCollection];
 
-    [NSNotificationCenter.defaultCenter postNotificationNameAsync:NSNotificationName_SyncConfigurationNeeded
-                                                           object:nil];
+    [SSKEnvironment.shared.syncManager sendConfigurationSyncMessage];
 
     self.areReadReceiptsEnabledCached = @(value);
 }
diff --git a/SignalServiceKit/src/SSKEnvironment.h b/SignalServiceKit/src/SSKEnvironment.h
index 02d6e04c9..d9bfbfcaa 100644
--- a/SignalServiceKit/src/SSKEnvironment.h
+++ b/SignalServiceKit/src/SSKEnvironment.h
@@ -28,6 +28,7 @@ NS_ASSUME_NONNULL_BEGIN
 @protocol OWSCallMessageHandler;
 @protocol ProfileManagerProtocol;
 @protocol OWSUDManager;
+@protocol OWSSyncManagerProtocol;
 
 @interface SSKEnvironment : NSObject
 
@@ -49,8 +50,9 @@ NS_ASSUME_NONNULL_BEGIN
                           ows2FAManager:(OWS2FAManager *)ows2FAManager
                 disappearingMessagesJob:(OWSDisappearingMessagesJob *)disappearingMessagesJob
                 contactDiscoveryService:(ContactDiscoveryService *)contactDiscoveryService
-                disappearingMessagesJob:(OWSReadReceiptManager *)readReceiptManager
-                contactDiscoveryService:(OWSOutgoingReceiptManager *)outgoingReceiptManager NS_DESIGNATED_INITIALIZER;
+                     readReceiptManager:(OWSReadReceiptManager *)readReceiptManager
+                 outgoingReceiptManager:(OWSOutgoingReceiptManager *)outgoingReceiptManager
+                            syncManager:(id<OWSSyncManagerProtocol>)syncManager NS_DESIGNATED_INITIALIZER;
 
 - (instancetype)init NS_UNAVAILABLE;
 
@@ -83,6 +85,7 @@ NS_ASSUME_NONNULL_BEGIN
 @property (nonatomic, readonly) ContactDiscoveryService *contactDiscoveryService;
 @property (nonatomic, readonly) OWSReadReceiptManager *readReceiptManager;
 @property (nonatomic, readonly) OWSOutgoingReceiptManager *outgoingReceiptManager;
+@property (nonatomic, readonly) id<OWSSyncManagerProtocol> syncManager;
 
 // This property is configured after Environment is created.
 @property (atomic, nullable) id<OWSCallMessageHandler> callMessageHandler;
diff --git a/SignalServiceKit/src/SSKEnvironment.m b/SignalServiceKit/src/SSKEnvironment.m
index 8aefcc811..a3f003d0b 100644
--- a/SignalServiceKit/src/SSKEnvironment.m
+++ b/SignalServiceKit/src/SSKEnvironment.m
@@ -32,6 +32,7 @@ static SSKEnvironment *sharedSSKEnvironment;
 @property (nonatomic) ContactDiscoveryService *contactDiscoveryService;
 @property (nonatomic) OWSReadReceiptManager *readReceiptManager;
 @property (nonatomic) OWSOutgoingReceiptManager *outgoingReceiptManager;
+@property (nonatomic) id<OWSSyncManagerProtocol> syncManager;
 
 @end
 
@@ -64,9 +65,9 @@ static SSKEnvironment *sharedSSKEnvironment;
                           ows2FAManager:(OWS2FAManager *)ows2FAManager
                 disappearingMessagesJob:(OWSDisappearingMessagesJob *)disappearingMessagesJob
                 contactDiscoveryService:(ContactDiscoveryService *)contactDiscoveryService
-                disappearingMessagesJob:(OWSReadReceiptManager *)readReceiptManager
-                contactDiscoveryService:(OWSOutgoingReceiptManager *)outgoingReceiptManager
-{
+                     readReceiptManager:(OWSReadReceiptManager *)readReceiptManager
+                 outgoingReceiptManager:(OWSOutgoingReceiptManager *)outgoingReceiptManager
+                            syncManager:(id<OWSSyncManagerProtocol>)syncManager {
     self = [super init];
     if (!self) {
         return self;
@@ -92,6 +93,7 @@ static SSKEnvironment *sharedSSKEnvironment;
     OWSAssertDebug(contactDiscoveryService);
     OWSAssertDebug(readReceiptManager);
     OWSAssertDebug(outgoingReceiptManager);
+    OWSAssertDebug(syncManager);
 
     _contactsManager = contactsManager;
     _messageSender = messageSender;
@@ -113,6 +115,7 @@ static SSKEnvironment *sharedSSKEnvironment;
     _contactDiscoveryService = contactDiscoveryService;
     _readReceiptManager = readReceiptManager;
     _outgoingReceiptManager = outgoingReceiptManager;
+    _syncManager = syncManager;
 
     return self;
 }
diff --git a/SignalServiceKit/src/SignalServiceKit.h b/SignalServiceKit/src/SignalServiceKit.h
index 593f09ef4..a702a7b22 100644
--- a/SignalServiceKit/src/SignalServiceKit.h
+++ b/SignalServiceKit/src/SignalServiceKit.h
@@ -5,3 +5,4 @@
 // Anything used by Swift outside of the framework must be imported.
 #import "OWSFileSystem.h"
 #import "OWSOperation.h"
+#import "OWSSyncManagerProtocol.h"
diff --git a/SignalServiceKit/src/TestUtils/MockSSKEnvironment.m b/SignalServiceKit/src/TestUtils/MockSSKEnvironment.m
index a1699492d..c55a09885 100644
--- a/SignalServiceKit/src/TestUtils/MockSSKEnvironment.m
+++ b/SignalServiceKit/src/TestUtils/MockSSKEnvironment.m
@@ -72,6 +72,7 @@ NS_ASSUME_NONNULL_BEGIN
     OWSReadReceiptManager *readReceiptManager = [[OWSReadReceiptManager alloc] initWithPrimaryStorage:primaryStorage];
     OWSOutgoingReceiptManager *outgoingReceiptManager =
         [[OWSOutgoingReceiptManager alloc] initWithPrimaryStorage:primaryStorage];
+    id<OWSSyncManagerProtocol> syncManager = [[OWSMockSyncManager alloc] init];
 
     self = [super initWithContactsManager:contactsManager
                             messageSender:messageSender
@@ -91,11 +92,13 @@ NS_ASSUME_NONNULL_BEGIN
                             ows2FAManager:ows2FAManager
                   disappearingMessagesJob:disappearingMessagesJob
                   contactDiscoveryService:contactDiscoveryService
-                  disappearingMessagesJob:readReceiptManager
-                  contactDiscoveryService:outgoingReceiptManager];
+                       readReceiptManager:readReceiptManager
+                   outgoingReceiptManager:outgoingReceiptManager
+                              syncManager:syncManager];
     if (!self) {
         return nil;
     }
+
     self.callMessageHandler = [OWSFakeCallMessageHandler new];
     self.notificationsManager = [OWSFakeNotificationsManager new];
     return self;
diff --git a/SignalServiceKit/src/TestUtils/OWSMockSyncManager.swift b/SignalServiceKit/src/TestUtils/OWSMockSyncManager.swift
new file mode 100644
index 000000000..cd3cf9eb5
--- /dev/null
+++ b/SignalServiceKit/src/TestUtils/OWSMockSyncManager.swift
@@ -0,0 +1,17 @@
+//
+//  Copyright (c) 2018 Open Whisper Systems. All rights reserved.
+//
+
+import Foundation
+
+#if DEBUG
+
+@objc
+public class OWSMockSyncManager: NSObject, OWSSyncManagerProtocol {
+
+    @objc public func sendConfigurationSyncMessage() {
+        Logger.info("")
+    }
+}
+
+#endif
diff --git a/SignalServiceKit/src/Util/OWSSyncManagerProtocol.h b/SignalServiceKit/src/Util/OWSSyncManagerProtocol.h
new file mode 100644
index 000000000..73540e29e
--- /dev/null
+++ b/SignalServiceKit/src/Util/OWSSyncManagerProtocol.h
@@ -0,0 +1,13 @@
+//
+//  Copyright (c) 2018 Open Whisper Systems. All rights reserved.
+//
+
+NS_ASSUME_NONNULL_BEGIN
+
+@protocol OWSSyncManagerProtocol <NSObject>
+
+- (void)sendConfigurationSyncMessage;
+
+@end
+
+NS_ASSUME_NONNULL_END
diff --git a/SignalShareExtension/ShareViewController.swift b/SignalShareExtension/ShareViewController.swift
index bc6c5eff1..38c42875e 100644
--- a/SignalShareExtension/ShareViewController.swift
+++ b/SignalShareExtension/ShareViewController.swift
@@ -104,9 +104,6 @@ public class ShareViewController: UIViewController, ShareViewDelegate, SAEFailed
 
         // We don't need to use "screen protection" in the SAE.
 
-        // Ensure OWSSyncManager is instantiated.
-        OWSSyncManager.shared()
-
         NotificationCenter.default.addObserver(self,
                                                selector: #selector(storageIsReady),
                                                name: .StorageIsReady,
diff --git a/SignalShareExtension/SignalShareExtension-Bridging-Header.h b/SignalShareExtension/SignalShareExtension-Bridging-Header.h
index e8f71533e..c7a9dd1b8 100644
--- a/SignalShareExtension/SignalShareExtension-Bridging-Header.h
+++ b/SignalShareExtension/SignalShareExtension-Bridging-Header.h
@@ -16,7 +16,6 @@
 #import <SignalMessaging/OWSContactsManager.h>
 #import <SignalMessaging/OWSMath.h>
 #import <SignalMessaging/OWSPreferences.h>
-#import <SignalMessaging/OWSSyncManager.h>
 #import <SignalMessaging/UIColor+OWS.h>
 #import <SignalMessaging/UIFont+OWS.h>
 #import <SignalMessaging/UIView+OWS.h>