This error seems to be related to Spectrum outages and one browser, in particular, seems to be having conflict with Spectrum.
This solution can be resolved in a couple of ways.
Spectrum’s website has had conflictions with the FireFox web browser. We’ve had success with resolving this issue by using Google Chrome, Microsoft Edge, Brave, or Opera web browsers are all great options to try and get around this issue. The issue seems to be related to potential outages or miscommunication between your device and their servers.
We highly advise that you contact Spectrum directly via phone or online chat using the link and number below!
Phone number: 1-855-707-7328
Support site: https://www.spectrum.com/contact-spectrum