Same issue for me today (March 3rd, 2023) and the Apple server status looked good. I had the issue on several projects. Restarting Xcode solved the problem for me. It is unbelievable and very sad that a 400Mds company is providing and forcing us to use such buggy environment....

As usual, Apple documentation is unclear about that. It should be called after you have called CallKit, it after reportNewIncomingCallWithUUID is done. It is still not clear for me how much time we have to call that completion handler. The version without completion handler must terminated within 30s (and this is again, not very well documented...)

I've just hit the same issue after switching to Xcode 14.3. Linking our iOS application with WebRTC C++ static library now produces 2500 warnings. I guess this is the dsymutil that has problems. Building for arm64 and WebRTC C++ library targets arm64 also.