Sorry for the frustration, you should now have the ability to sign into the admin center.
You should have access to the admin center now when you sign in.
Sorry for the trouble there.
I have made a change to your login so you should regain Admin Center access now. Let us know if there are any more problems.
Sorry for the error there.
Have you tried the same admin maneuver in an alternate web browser to test?
If so, then please reach out directly to Customer Support for the fastest resolution, or click my name in the Community to send me a private message with the admin email spelling.