We are preparing to transfer one of our live applications to a different Apple Developer Organization and need clarification to avoid service disruption.
We would like guidance on the following points:
- Sign in with Apple and Service ID Transfer:
We want to confirm whether the Service ID used for Sign in with Apple must be transferred along with the app, or if its configuration will automatically migrate as part of the transfer. Additionally, is there a way to verify whether the app currently has any explicit association or dependency with the existing Service ID on the current developer account? As per our findings, we do not have a ServiceID associated with SIWA. The SIWA is handled natively by iOS.
- Creating or Updating a Service ID Before Transfer:
Since, the ServiceID is not associated, if we create a new Service ID now and assign it to the existing app for Sign in with Apple, will this have any impact on users who are already using the live app? Specifically, will creating or modifying a Service ID change the authorization state for currently authenticated Apple Sign In users?
- Transfer Identifier Timing:
The transfer process requires generating a transfer identifier. Should this be done ahead of the Account Migration or only at the start of the transfer? Also, will generating or using the transfer identifier require any change on the client side related to Apple Sign In?
We would appreciate recommendation for these steps and whether users should expect any authentication or billing disruptions during or after the app transfer.