I'm in the same boat. Also want to transfer app from my one account to another. I don't understand why there's no way to simply change the company info for the developer account. I don't have the sub values (unique identifiers) of Apple Sign in users. Is there a way to get them retroactively? Also, if I don't migrate the Apple Sign in users, will the privaterelay emails change for the new team? That's what I use to authenticate and track app progress.

This technote is helpful. What if I don't have the sub values (unique identifiers) of Apple Sign in users? Is there a way to get them retroactively? Also, if I don't migrate the Apple Sign in users, will the privaterelay emails change for the new team? That's what I use to authenticate and track app progress.

In addition to becoming a different sub value, did the privaterelay email also change for the same user from old team to new team?