I can't log in via F2A!

[Eve]

I recently upgraded my iPhone and I didn't know that the Microsoft Authenticator app doesn't automatically include itself in the iCloud backup. 

So when I got my new phone and loaded from my backup, it had deleted all of my authenticator details - one of which, is Trello. 

I thought, ah, no probs - I'll edit my 2FA options in Trello.com, and then generate a new QR code through there. But, to get to the 2FA options on Trello.com, I need to generate an authenticator code. But I can't generate an authenticator code, because the account has been deleted. 

[Torben_trello · Accepted solution]

Without access to that app you can use the backup codes to log into your account and make changes. When you set up 2FA, you were given a set of backup codes to print/download, which are the primary recovery method for your account. They can be used in the same way as a code that would be app generated.

If that does not work for you, please reach out to trello.com/contact from the email address registered in your account.

[Eve]

I realised ... about an hour after I'd put this message up in a blind panic, that I had been given backup codes. One of those did indeed get me back in. 

Phew! 

Thank you for the response!