diff --git a/src/components/syncPlay/core/Controller.js b/src/components/syncPlay/core/Controller.js
index f4a1753a71..cf4d1bf27e 100644
--- a/src/components/syncPlay/core/Controller.js
+++ b/src/components/syncPlay/core/Controller.js
@@ -72,7 +72,7 @@ class Controller {
         const sendPlayRequest = (items) => {
             const queue = items.map(item => item.Id);
             apiClient.requestSyncPlayPlay({
-                PlayingQueue: queue.join(','),
+                PlayingQueue: queue,
                 PlayingItemPosition: options.startIndex ? options.startIndex : 0,
                 StartPositionTicks: options.startPositionTicks ? options.startPositionTicks : 0
             });
@@ -135,7 +135,7 @@ class Controller {
             Helper.translateItemsForPlayback(apiClient, options.items, options).then((items) => {
                 const itemIds = items.map(item => item.Id);
                 apiClient.requestSyncPlayQueue({
-                    ItemIds: itemIds.join(','),
+                    ItemIds: itemIds,
                     Mode: mode
                 });
             });
@@ -146,7 +146,7 @@ class Controller {
                 Helper.translateItemsForPlayback(apiClient, result.Items, options).then((items) => {
                     const itemIds = items.map(item => item.Id);
                     apiClient.requestSyncPlayQueue({
-                        ItemIds: itemIds.join(','),
+                        ItemIds: itemIds,
                         Mode: mode
                     });
                 });
diff --git a/src/components/syncPlay/core/PlaybackCore.js b/src/components/syncPlay/core/PlaybackCore.js
index b1bc6c106d..6916aebbe3 100644
--- a/src/components/syncPlay/core/PlaybackCore.js
+++ b/src/components/syncPlay/core/PlaybackCore.js
@@ -129,14 +129,19 @@ class PlaybackCore {
         const now = this.timeSyncCore.localDateToRemote(currentTime);
         const playlistItemId = this.manager.getQueueCore().getCurrentPlaylistItemId();
 
-        const apiClient = this.manager.getApiClient();
-        apiClient.requestSyncPlayBuffering({
+        const options = {
             When: now.toISOString(),
             PositionTicks: currentPositionTicks,
             IsPlaying: isPlaying,
-            PlaylistItemId: playlistItemId,
-            BufferingDone: !isBuffering
-        });
+            PlaylistItemId: playlistItemId
+        };
+
+        const apiClient = this.manager.getApiClient();
+        if (isBuffering) {
+            apiClient.requestSyncPlayBuffering(options);
+        } else {
+            apiClient.requestSyncPlayReady(options);
+        }
     }
 
     /**
diff --git a/src/components/syncPlay/core/QueueCore.js b/src/components/syncPlay/core/QueueCore.js
index b9362b839e..25ef434873 100644
--- a/src/components/syncPlay/core/QueueCore.js
+++ b/src/components/syncPlay/core/QueueCore.js
@@ -176,12 +176,11 @@ class QueueCore {
             const currentPositionTicks = Math.round(currentPosition * Helper.TicksPerMillisecond);
             const isPlaying = playerWrapper.isPlaying();
 
-            apiClient.requestSyncPlayBuffering({
+            apiClient.requestSyncPlayReady({
                 When: now.toISOString(),
                 PositionTicks: currentPositionTicks,
                 IsPlaying: isPlaying,
-                PlaylistItemId: this.getCurrentPlaylistItemId(),
-                BufferingDone: true
+                PlaylistItemId: this.getCurrentPlaylistItemId()
             });
         }).catch((error) => {
             console.error('Error while waiting for `playbackstart` event!', origin, error);