Ok, so i found out why i cant log in with the other user, and i hoe there is a workaround. I have to put the whole qualified name in the user field in orther to log in. For example i have to put in the username "firstname.lastname@example.org" in order to be able to log in.
This might pose a problem for me, please tell me i dont have to put in all that in the username.
Also Im still having the problem with my original account still being able to log in but it is deleted.
Dont know why...