I'm having this problem almost two years later. I can reset my password on my.avast, and it automatically logs me in, but if I logout and try to log back in it says my password and email don't match. I also cannot login on the Avast program (Windows 10), it gives me the "does not match" error, too, and there's no way to login there at all.
What are the password requirements? Those aren't explained anywhere. How long can my password be? Can it include special characters? I'd love a mod answer to these questions. Thanks!