This is horribly frustrating and I'm sorry you are facing this.
The thing I have taken away from these continual Tell HN posts about Google acounts getting locked up because of 2FA is that the "something you have" factor needs redundancy. I now have my phone, and 4 yubikeys on my household's carkeys and a trusted friends and a family member's firesafe. These have also given me enough stress that when I visited home for the holidays I added to my aging parents' Google accounts with a handful of additional security keys to go with their SMS 2FA.
Personally I would rather have accounts which are secure and can be lost if I am not careful with my 2nd factors than one that has vulnerabilities that the whole internet can attempt to exploit, but I realize others do not have that same priority.
The thing I have taken away from these continual Tell HN posts about Google acounts getting locked up because of 2FA is that the "something you have" factor needs redundancy. I now have my phone, and 4 yubikeys on my household's carkeys and a trusted friends and a family member's firesafe. These have also given me enough stress that when I visited home for the holidays I added to my aging parents' Google accounts with a handful of additional security keys to go with their SMS 2FA.
Personally I would rather have accounts which are secure and can be lost if I am not careful with my 2nd factors than one that has vulnerabilities that the whole internet can attempt to exploit, but I realize others do not have that same priority.