I had Firefox account, which is used to community translation contribution (not bookmark, password or other data) and last month I lost my 2FA app and now without 2FA for this account, so try to use 'backup authentication code' method. - Used 'backup authentication code', which I had 8 of 10 letters/digits code generated (on 16 May 2019 and only email), it is not working - I am able to change the password, but still asking 6 digit code, which I don't have - I have secondary email, but can't be used to login as per documentation.

I have two questions - Why 'backup authentication code' is not working? how to verify if backup method is working or not when it needed? - Can I request to delete my account to create again as I have secondary email as I can verify identity and ownership of that account with secondary email?