Hi @Dick_Long, Thanks for your questions. You wrote: A. From the document above, can I performed the Steps 1&2 before the app transfer? if so, is there a maximum lead time for these transfer_subs? To migrate their users, the transferring team (Team A) must obtain their user access token(s) and generate a transfer identifier(s) prior to initiating the app transfer. If the app belongs to an app group, Team A must also ungroup them before initiating the transfer. If the app is configured with a Services ID, it will also transfer. If Team A wants to keep the Services ID, they must remove the association with the app before initiating the transfer. Important: If a user doesn’t use any other applications from Team A, Team A will no longer be able to communicate with the migrated user using their private email address after the transfer. Next, you wrote: B. Regarding Step 5(Team B exchanging transfer identifiers via https://appleid.apple.com/auth/usermigrationinfo) are there specific rate limits (requests per se