Hi,
I don't have any switch added to Central at this moment to test.
Are you still able to access the "config terminal" through cli?
If yes, you can try using the commands bellow to create a new account with configuration permissions.
Create a new group:
#aaa authorization group admin-group 10 match-command configure.* permit
#aaa authorization group admin-group 20 match-command .* permit
Create a new user:
aaa authentication local-user admin-user group admin-group password plaintext