What do you mean by ”synchronised to other devices”? When I use the development environment in CloudKit the data is available in the CloudKit dashboard immediately after saving on device. But when using the production environment maybe only 1/10 of the data is uploaded and I don’t understand why it differs. Both environments are equal.

Thanks for your suggestion but even with the enabled exception breakpoint this error is not caught. I don't think it has anything with synchronisation to do nor throttling because it just occurred directly after the failed schema initialisation. Also I have no records in the database because it's not publicly released. I have also tried to reset the development container in CloudKit dashboard, uninstall and build the app again. I don't know what more to do to do a "reset".

Oh wow, I just found out that the "CDMR" entity now needed recordName and modifiedTimestamp indexes which it didn't have previously. After I added these indexes the console warning disappeared.

Soooo.... any help here would be very appreciated.

Yes, without “Full Keyboard Access” nothing happens when I try to navigate with the keyboard.