Live Link Face App for IPhone (ios 15.5) only Blackscreen and Crash on Record

Hello there,
I try to use the Live Link Face App on my IPhone 8 Plus with IOs 15.5 to connect to Unreal 5 Engine. But the App doesnt work. There is no Live Stream on the App. I allowed the usage of Camera and Microphone.
If i press record the App crashes.
I hope someone has a Hint get it to work.