Thanks @Claude31, I reset the constraints and the error disappeared. Also the other messages have disappeared! It's ok now. Cheers.

I posted this on StackO, a kind user said the message can be safely ignored. FYI. Thanks!

Thanks WindowsMEMZ, meanwhile I write to Apple support, and after sending them all they asked for, and each time asking if I should re-distribute with a new build and version, they said yes on 3rd time. Let me try. Cheers.

Turns out my 'smart' friends had silent mode on!! 🤦‍♂️