@bluefalcon brother i am facing the same problem now
i delete my mircosoft auth wihtout making a backup and now i lost my opera auth code and when ever i try to login i have to use my backup code to login my opera and when i try to deactive my 2FA it keep sending me back to the login page and when i login using those backup code it just send me to that setting page again and this circle continue to loop so did you also find the solution of this ??
and i also thinking to switch from oprea gx to brave since opera user login issue seem to be no longer going to be resolve and the devs arent giving a damn
i even look in there offical oprea gx guide manuall there is no other way to get your 2FA without a 2FA code
Opera account