ClayClai
New to this stuff or not there is a resolve. My devices have been installed 4 years with no problem prior to the lost connection and refusal to see my wifi. I also did have a dialogue with Roku's support, and finally figured it out myself. Firmware update? Most likely. The beauty of tech is the rapid changes.
It's not an internal network issue. It needs to be addressed with Spectrum (in your case). I didn't need to get on the phone with Comcast and quite frankly, I don't like grinding up my time when I do a better job navigating this stuff myself.
In any event, call them up and discuss that M.A.C. address and make sure it is being acknowledged on their side. Whatever Roku changed (firmware etc...), doesn't matter. Get that M.A.C. address squared away. It's not anything with the router.
My devices (and I have plenty as well), had no issue. My firestick even connected with no issue. Again, call them and get that M.A.C. address acknowledged. It's a pain in the **bleep**, but you'll be back in business once that permission is granted (on their side). I don't know why the update has set off a rejection on the service provider side, nor do I care, these things sometimes happen with updates as you well know.