There are some apps (like video player) that if you open it, the screen won’t lock. Because it’s hard to figure out which screen wouldn’t lock, I enable the Accessibility feature which has a lock button in it. I also put in a “Lock” button in the same location on all my home screens. I lock the phone manually except on the screen I know for sure the phone will lock automatically.
Supposedly, if you click on the 2FA link on a mobile, it will launch your 2FA app to capture the info. But if that doesn’t happen, you can right click on the button, and copy the secret to create a record in your 2FA app manually. The app has to support SHA-256, so I think pretty much Authy, Microsoft Authenticator, Google authenticator, etc. are out. Supporting apps include 2FAS and Aegis.
If this can’t be done, you should click Remove 2FA and save. Otherwise, you might loose your account. On some instances and on Firefox, you may want to do this with all the extensions disabled. Some extension seems to somehow get you logged out clicking refresh.