Yep, makes sense. Filing one too. Hoping this gets resolved soon.

I posted the play code also because I was able to play from this initially. Just wanted to check if I missed something when the app was shut which is not letting me connect again

package com.lishash.lishash.plugins; import android.app.Activity; import android.content.Context; import android.content.Intent; import android.util.Log; import io.flutter.plugin.common.MethodChannel; import io.flutter.view.FlutterView; import io.flutter.app.FlutterActivity; import com.apple.android.music.playback.model.MediaContainerType; import com.apple.android.music.playback.model.MediaItemType; import com.apple.android.music.playback.model.PlaybackState; import com.apple.android.music.playback.model.PlayerMediaItem; import com.apple.android.music.playback.queue.CatalogPlaybackQueueItemProvider; import com.apple.android.sdk.authentication.AuthenticationFactory; import com.apple.android.sdk.authentication.AuthenticationManager; import com.apple.android.sdk.authentication.TokenError; import com.apple.android.sdk.authentication.TokenProvider; import com.apple.android.sdk.authentication.TokenResult; import com.apple.android.music.playback.controller.MediaPlayerController; import com.apple.android.music.playback.controller.MediaPlayerControllerFactory; import com.lishash.lishash.MainActivity; public class AppleMusicPlugin extends MainActivity { private static final String CHANNEL_NAME = "lishash.plugins.apple_music"; //MediaPlayerController playerController; private static final String dev_token = " "; //developer token given by apple musicKit private String musicUserToken = ""; private MethodChannel methodChannel; private AuthenticationManager authenticationManager; private static final int REQUESTCODE_APPLEMUSIC_AUTH = 3456; private static final String LOG_TAG = "Apple_Music_Plugin"; private MethodChannel.Result authTokenResponse; static { try { System.loadLibrary("c++_shared"); System.loadLibrary("appleMusicSDK"); Log.d(LOG_TAG, "loaded libraries"); } catch (final Exception e) { Log.e(LOG_TAG, "Could not load library due to: " + Log.getStackTraceString(e)); throw e; } } public AppleMusicPlugin(FlutterView flutterView, Context context, MainActivity activity) { final MethodChannel channel = new MethodChannel(flutterView, CHANNEL_NAME); channel.setMethodCallHandler((call, response) -> { Log.d(LOG_TAG, "Welcome to Apple Music Plugin Handler"); switch (call.method) { case "authenticate": Log.d(LOG_TAG, "Apple Music Plugin Auth Handler"); authenticate(response); break; case "playSong": playSong(response); break; default: response.notImplemented(); } }); //this.mChannel = channel; this.mContext = context; this.mActivity = activity; } private final Context mContext; private final Activity mActivity; private void authenticate(MethodChannel.Result response) { authTokenResponse = null; if (authenticationManager == null) { authenticationManager = AuthenticationFactory.createAuthenticationManager(this.mContext); Log.d(LOG_TAG, "AuthenticationManager created"); } Intent intent = authenticationManager.createIntentBuilder(dev_token) .setHideStartScreen(true) .setStartScreenMessage("To play the full song, connect Apple Music") .build(); Log.d(LOG_TAG, "AuthenticationManager intent built"); Log.d(LOG_TAG, "data " + intent); mActivity.startActivityForResult(intent, REQUESTCODE_APPLEMUSIC_AUTH); Log.d(LOG_TAG, "Activity started"); authTokenResponse = response; } public void getMusicUserToken(Intent data) { Log.d(LOG_TAG, "Getting music user token"); TokenResult tokenResult = authenticationManager.handleTokenResult(data); Log.d(LOG_TAG, "tokenResult:" + tokenResult); if (!tokenResult.isError()) { musicUserToken = tokenResult.getMusicUserToken(); Log.d(LOG_TAG, "Music user token is: " + musicUserToken); authTokenResponse.success(musicUserToken); //creating playback controller } else { TokenError error = tokenResult.getError(); Log.d(LOG_TAG, "Error getting token: " + error); } } TokenProvider tokenProvider = new TokenProvider() { @Override public String getDeveloperToken() { Log.d(LOG_TAG, dev_token); return dev_token; } @Override public String getUserToken() { Log.d(LOG_TAG, musicUserToken); return musicUserToken; } }; private void playSong(MethodChannel.Result response) { Log.d(LOG_TAG, "Play Song Button pressed"); MediaPlayerController playerController = MediaPlayerControllerFactory.createLocalController(this.mContext.getApplicationContext(), tokenProvider); Log.d(LOG_TAG, "Player controller defined"); // MediaPlayerController playerController; CatalogPlaybackQueueItemProvider.Builder queueProviderBuilder = new CatalogPlaybackQueueItemProvider.Builder(); Log.d(LOG_TAG, "queueProvider built"); queueProviderBuilder.items(MediaItemType.SONG,"673575193"); Log.d(LOG_TAG, "Song added"); //queueProviderBuilder.startItemIndex(queueIndex); //Log.d(LOG_TAG, "Song added"); playerController.prepare(queueProviderBuilder.build(), true); Log.d(LOG_TAG, "queue prepared"); // PlayerMediaItem.getArtistName(); }

Yeah, I'm still stuck on this too. I keep getting the same error every time I try to authenticate(with this app, old versions, sample code) to apple music on my phone ever since that error happened first. :\