We try to exchange 'Sign in with apple' between 2 teams, we proceed as follows:
The old team generates a transfer_sub for the new team, the request (https://developer.apple.com/documentation/sign_in_with_apple/transferring_your_apps_and_users_to_another_team) here looks like this:
curl -sS --location --request POST "https://appleid.apple.com/auth/usermigrationinfo" \
--header 'Content-Type: application/x-www-form-urlencoded' \
--header 'Authorization: Bearer XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX' \
-d "sub=$oldUserSub&target=$newTeamId&client_id=$oldAppBundleID&client_secret=$oldSecret"
This works perfectly, the old team receives a transfer_sub and gives it to the new team.
{"transfer_sub":"XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX"}
The new team gets the new ID with the following request (https://developer.apple.com/documentation/sign_in_with_apple/bringing_new_apps_and_users_into_your_team):
curl -sS --location --request POST "https://appleid.apple.com/auth/usermigrationinfo" \
--header 'Content-Type: application/x-www-form-urlencoded' \
--header 'Authorization: Bearer XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX' \
-d "transfer_sub=$transferSubFromOldTeam&client_id=$newAppBundleID&client_secret=$newSecret"
Unfortunately this does not work because there is an error return:
{"error":"invalid_request"}
Does anyone have an idea what to do to make the relegation valid?