If you can't write .p12 file from .cer ... (greyed out)

... make sure your .certSigningRequest file is one from Key Chain Access on your current Mac, and it has key pair information.

Then, you submit it to Apple developer console and download .cer file.
With double clicking .cer file, you can see it on the Key Chain Access and hopefully you can choose .p12 extention to write.

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