tvOS package for distribution fails to find valid certificate and valid provision [UE-39501] [Workaround]

, I am doing this all on the same Mac.

I tried to generate a .p12 file (both to try and to send to you), but it does not seem to be an option (Note how the export to .p12 option is greyed out).

Do you have some instructions on how to generate the .p12 that might work? [These instructions appear current, but don’t work.][1]