Well those modem/router combo devices were direct sold to ISP’s. they weren’t sold to individuals and for that reason the ISP is supposed to support them.

Maybe the ISP changed the firmware to disable features on them or quit supporting them. You’d have to contact your isp. 

From the fact that 2 different devices had the same issue on provisioning from your ISP, I’d highly be suspecting that. 

Thank you for the reply.  I have asked 2 different Spectrum reps, and they claim that because it is customer provided equipment, that they don’t do any special configuration on it, other than to register the device on their network.  But given the behavior of the device, it definitely seems like something in the firmware is controlling it.  Everything else on the modem seems to work just fine.  It is just the inability to enable wifi.  Frustrating… but I think I can work around it.

Go to 192.168.100.1:8080 in your browser window and enter cusadmin for the username and password for the password.

see if that login method lets you access any different features

Thank you for the reply recommending cusadmin for username.  Unfortunately, that did not open up any additional features.  I ended up just getting a wireless router to solve the wifi issue.  Spectrum has told me they do not do anything to control the wireless feature on customer owned equipment.  But something seems to have happened over the last few days to control the firmware.

Hope the stand alone router works well for you!