Comment by illiac786

Well if you lost your only credential and it’s a secure solution, it’s gone. You must set it up from scratch again.

Since we’re discussing not providing your phone number out of privacy/security concerns, I assume that “registration lock” and PIN are on the table, which would anyway block you from registering again using the same number after loosing your phone.

Hence, the situation is the same as with your mobile phone number: no backup, no luck.