It took me far too long to investigate and discover how to renew my Blogger domain name/URL after getting a message from ENOM saying that my auto-renewal payment details were no longer valid (which will happen every two years…)
After lots of Google-ing and reading frustrated forum posts, I finally found this, hidden in plain sight on Google’s help page (but not the Google help page that Google thought I needed):
Use bloggeradmin@[yourdomain.com] to log into Google’s G Suite Admin dashboard
If you forgot your password, at least knowing that above email address will allow you to start the password recovery process.
That’s really is the entire solution — I hope this helps you find the solution faster than I did!