@Calebsmum, you correctly note that THS has introduced quite a few “improvements” to its technology platform over recent whiles.
Ironically, we advocated for the introduction of 2FA technology on the basis that it was a mature technology. THS implementation was, at best, poor. Sorry to hear that you are still struggling.
Unfortunately 2FA has been around for more than a decade now and we don’t see it being removed, regardless of THS. Personally, we’d encourage that you find a good password manager or 2FA manager.
1Password or ProtonPass offer good password managers, though there are others. Such apps tend to address username, password and 2FA code for each website. Sounds like that may help you.