Can't validate and submit an App to the Mac App Store

Question

I\'ve done codesigning and submitting for iOS apps countless times. This time it struck me with the Mac App Store. I\'m repeatedly getting the same error message:

Answer 1

OK, I have some important pointers (additional to Apples documentation) for people stumbling over similar issues.

1. The error message is totally misleading.
2. Don't take every word in Apples documentation too seriously.

For solving the issue, 2 points have been most significant:

1. Additional to all the other profile-mess you need 2 certificates for submission to the Mac App Store (contrary to the same process for iOS App Store submission). Both have to be installed together with their corresponding public and private key pairs.
   1. Mac App
   2. Mac Installer
2. The codesigning needs to be set on the build target, not the project. I don't remember where but this was described wrong side around in one of Apples documentations.

Eventually my submission worked by keeping to those 2 points.