I had a member not able to enter or reset their 2FA for account verification. A private message was popping up with its element overlapping the verification window, see image below.

I was able to use uBlock's element zapper to remove it. This enabled entering in the answer to their 2FA question.

Possibly a bug?

Ted.

Would advise switching to an unmodified theme to see if still presents itself and ensure all third party items are disabled.