How to make sure team ID is in the iOS signing certificate for iOS builds

I thought I had got the certificate part down, because the last build error mentioned nothing about it but instead said that the screen sizes where wrong.

So I tried my best to go over the screen sizes and make sure I had nothing oversized.

Now I try to build again, and I get the error. "No signing certificate with private key matching team id.,… Found.

What is the deal with these iOS signing certificates and is there anybody in this community who has created an accurate step by step tutorial??? The one in appgyver docs must not be correct.

Please help community. :blue_heart::pray: