BT coupling iPhone X with PCM in 991.2

Good morning together, I would have a question: my iPhone X automatically connects to the PCM when starting the 991.2 via BT; i.e. I can call up my phone contacts via the PCM and also dial them. Since I also use my iPhone as iPot, I was able to play my music via BT until two weeks ago, if I go to the PCM on media. For about two weeks this is no longer possible, under Media only the “Jukebox” is displayed (which is empty) and my iPhone is not recognized under Media. t. Also the direct playback of the audio files from the IPhone for no transfer to the PCM. You can see on the iPhone that the music is played, but the speakers remain silent. Do I still have to set something somewhere? Does anyone have an idea? I can rule out errors on the iPhone, because with my other vehicle the playback works quite normal via BT. Greetings knolfi