Can't log into classic, asked for authenticator

Trying to log into classic ahead of the name reservation and every time I’m prompted for an old school style authenticator… I have mobile authenticator and I used to have an old one but even using that didn’t work. My mate can log in fine - what gives?

If things like your IP address change you can be prompted for the code, and a mobile authenticator can give you the old style code.

Thanks, seemed to fix itself, guess it was a blip.