Just installed 2.1 and imported vB 4. In setting user group permissions I used the set all to yes option not realizing it required 2FA. So I went through 2FA once on my account then turn it off. Now everytime I login I still have to use 2FA even though it's not on in any of the user group roles/permissions. So it seems once I had to use 2FA it won't stop using it going forward.