I'm facing the following issue when I try to use the API https://appleid.apple.com/auth/usermigrationinfo I am currently preparing for app migration and planning to use auth/usermigrationinfo to generate a transfer identifier. My request parameters are as follows. sub=( team-scoped user identifier) target=(Team ID Target 10 letters) client_id=Bundle id client_secret= Secret generated with private key However, after calling the API, I received the following error response. { "error": "access_denied" } Does this API call have a time limit, and must it be called only after the app migration is completed? Thanks & regards