@Dereckson Thank you, I can confirm it was disabled. I can now log in again from my phone. I will re-enable 2FA later tonight (and this time lock the hard-copy code into a file cabinet or lock box to be sure it isn't lost).

@Dereckson My IP is dynamic; but frequently remains stable for months at a time. I fully support the use of a steward request for a checkuser to authenticate my identity. If needed, the email linked to my user account can also be contacted to request agreement of a checkuser.