Hey @ian_fell,
Welcome to the Auth0 Community!
I checked your account and found that you have two accounts: one with an email and password combination and the second with Google Social.
It looks like the one with your email and password was the first account you created. I recommend that you try to log in to that account to regain access to the existing tenants you have.
If you are still having issues, could you share if you have any issues with MFA? If possible, could you share a screen recording with me in a direct message so that I can look into this further?
Thanks,
Rueben