Why are ALL of my computer login attempts to watch tv failing?

This has been a cascading issue; first it started a couple months ago on Firefox, and then on Chrome, and now Edge and Safari. I keep getting varied failure messages; most of them telling me to change my password. Conversely, with my same login, I am able to access my Spectrum/Charter account to view those details and access my email. These blocked login attempts are solely with the watch.spectrum.net computer access attempts. And yes, I have gone through clearing out my entire history, cookies, restarting my computer, and installing/attempting multiple browsers on different computers (Apple and Windows). Seriously… WTF??? And yes, I even changed my password as previously instructed, and the issue is spreading like a virus… or as we would say in the military, has Spectrum launched a self-inflicted denial of service attack.