Thanks KMT, not sure what you mean by such apps? Core Data apps?( I've been submitting appeals in the resolution centre, now they want to call. Let's see what happens)

Hi, I personally found iOS courses by the following instructors extremely helpful: On Udemy: Angela Yu David Kababyan Nick Walter And Chris Chng on Code With Chris. Hope that helps, these are excellent teachers for beginners. I have launched 5 iOS apps Aso far thanks to these guys. And they respond pretty quickly in the relevant forum. Good luck.

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!! 🤦‍♂️