I made a service in march to use a domain for a GitHub page. I forgot about it and the email for suspension was moved to my spam folder. I just need to unregister the domain so I can stop using it. I cannot unregister because its used by GitHub.
as far as i can tell your account was terminated
after over 120 days without signing in,.(past the 30 day required sign in)
and has no domain associated with it.