Firefox authentication code says "password incorrect" when signing in.

I am trying to sign in on Firefox after I signed out. I input my email and password, and get told that Firefox has sent a code to my email. I enter the code, but then get told "Incorrect Password". However, I know the password is correct, since it sent me the email code and if I do put in an incorrect password, it does not do that. It does not say that the code was wrong. In addition, since I have two email addresses associated with my account, it requires me to put in my primary address, but then changes it to my other address (which is the one I made the account with). I tried doing a fresh install of Firefox, but it does not seem to have helped. This is very frustrating, because I had to make an entirely new account to post this, since I could not sign in to my normal account.