This partially happened to me on NBA League Pass. It was particularly confusing because I wasn't completely locked out. The failure mode was that my password

This partially happened to me on NBA League Pass. It was particularly confusing because I wasn't completely locked out. The failure mode was that my password was one character too long, and was truncated. On the login form, the length was restricted by javascript if you typed in the password, but using auto-fill from 1Password bypassed that. I thought they were locking me out for proxying or something until eventually by luck I noticed what was going on.