I too have encountered this issue

@gchiste Any update on this? @fivestones I filed an "enhancement request" using the "Feedback Assistant" as suggested, but the link is apparently useless for sharing publicly.

I'm also experiencing this issue. It's very frustrating. Can someone from Apple please provide an update on this?

Since creating this post, I've learned that the original sub is stored in Firebase as the uid inside the providerData that is a part of the User Record, and so we have access to what we need in order to to request the transfer_sub from Apple... but it's apparently not possible for us to modify the providerData after we receive the new sub after transferring the app to the new team, so it seems that we are forced to create our own custom auth on the Firebase side for Sign in with Apple users so that the auth process on Firebase can properly grant a user access to their account after we switch teams. Has anyone gone through this process before? If so, any suggestions for how to implement a custom auth on the Firebase side for this scenario?

@DTS Engineer Has there been any progress with creating an API to allow us to read and modify the "caption" on a photo?