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

This is what it was for me as well.

Just want to clarify, you absolutely need both Mac App Distribution and Mac Installer Distribution certificates. Thanks Jacque for your explanation above. It should look like this: