«This email address is not available» for Apple ID despite the address is not used for any Apple ID as the primary nor as a recovery one
I have 2 Apple ID accounts:
The second account was previously linked to another email address:
I have re-linked the account today.
Now, the first email address is not used as the primary nor as a recovery email address for any Apple ID.
I want to re-link the first Apple ID account from to the second, but the system forbids me to do it: «This email address is not available».
[Edited by Moderator]