Facebook live Video music mix missing UR 24C

Dear all,

We are using the UR 24C to mix in Facebook live videos the music from an iPad and voice from the mic and transfer it directly in the IPhone streaming the Live Video. This was working without any issues. But now only the Sound of the mic is available and the music is missing. This worked without any problem until roughly two weeks ago. There was no change in the app Settings, Hardware or connections. Doing the recording locally on the iPhone is still working. Is there anything known that Facebook is blocking here something or anything else was changed ? Every Idea Is highly appreciated.

Thanks and kind regards