iOS Code Signing Fail Checklist

This is one of the biggest FAQ's we get on the mailing list: I followed the iOS signing tutorial or video tutorial and still didn't succeed in signing (notice that you need to actually read the links above, the certificate you get from the apple website is not enough!).

How do I debug something like this?

Notice that some of these signing failures will sometimes manifest themselves during build and sometimes will manifest during the install of the application.

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