Cannot delete user with changed Apple ID

Hay guys,

I have two users on my MacBook. User A and user B. Both are mine and using the same Apple-ID.

At some point I changed my Apple-ID because I started using a new E-Mail address for all my stuff. I changed this Apple-ID also on both users on my MacBook.

Now I am trying to delete user A while being logged in as User B. But the Mac is asking for the password for the old Apple-ID. It says 'type in the password for the Apple-ID xyz' while xyz being the old E-Mail address I changed months ago. The system tells me, the typed in informations are incorrect - of course because I changed the address.

When I try to log in on other Apple services with the old E-Mail address, it also doesn't work.

So how can I get the old user to get deleted?

Seems like a bug, right. That some variable wasn't updated or something. The Mac should take the current Apple-ID for the user not some old version which was changed.