I have updated XCode to version 16.2 and the issue has been resolved and I can now upload app builds again.

Hi, I've had the same problem using XCode 15.4 and I've been able to solve my local execution problems by creating the application as multiplatform instead of targeting it only for macOS. The problem I'm encountering now, which didn't happen to me a month ago, is that when I try to distribute a new version to the appstore, the submission process fails, returning the attached error. Is it possible to fix this? "Provisioning profile failed qualification. Profile doesn´t support App Groups"

Thanks for your answer. The link that you have attached indicates how to create the public key, but I have solved this part. The problem resides in creating the private key using the modulus and private exponent (not to be confused with the public exponent that is used for the public key).