Locked out of my account with 2FA

I had a disk failure (where the reset code was stored) and I have a new telephone, which means I can’t login to my AMO account any more.
What to do now?

Do you mean you’re locked out of your Firefox Account?

Yes, the one at https://accounts.firefox.com/oauth/signin

Then I suggest you look for help on https://support.mozilla.org/. We can’t help with issues in the Accounts side of things.