Your set up looks fine from the screenshots provided. However, it looks as though you’re using a .cer file as the certificate. If you’re attempting to use this on a Mac other than the .CSR, you’ll need to generate a .p12 in Xcode. .cer files will only work on the computer that the .CSR was generated on.
If you’d like, we can further debug the issue if you could provide us with the .p12.
I’ll post this on your other question too, just in case - thanks!