Hello everyone,
I’m trying to better understand the expected behavior of Sign in with Apple after an app is transferred to another Apple Developer Team.
Specifically, my question is about users who do not open or sign in to the app during the 60-day migration period after the app transfer.
Here is the scenario we are concerned about:
An existing user created an account using Sign in with Apple. The user is using a private relay email address. The app is transferred to another Apple Developer Team. The user does not sign in during the 60-day migration period. The user signs in again only after the 60-day period has ended.
In this situation, is there any possibility that Apple may provide different user-related values compared to the values before the app transfer?
For example, I am referring to values such as:
sub private relay email address ID token claims any other API response value that may be used to identify the user
The reason I’m asking is that if any of these values change after the transfer, our backend may not be able to match the user to the existing account in our database. In that case, the user could incorrectly be treated as a new user.
My understanding is that the purpose of the Sign in with Apple migration process after an app transfer is to associate the user identifier from the original Team with the user identifier for the new Team.
However, I would like to confirm what happens if the user was not processed during the 60-day migration period and signs in later.
Do the values provided by Apple remain consistent in this case, or can they change after the migration period ends?
If they can change, should we prepare our own account recovery or re-linking flow to handle these users?
I would appreciate any clarification on Apple’s expected behavior and the recommended approach for this case.
Thank you.