Activision Account linked what to do to undo it?

I recently accidentally unlinked my Psn account on activision now it says Account can't be unlinked

Then I wrote to support, then I got an answer even though I was on my 2acc. On the Cod app you can see that my account still exists and you can still see my brother's account, but you can invite me or something else. How could I get my account? Do I have to wait 12 months now or is there another method?

I think you have to wait 12 months or you can set up another account.