Motorola 7550 activated but no internet/wifi

I setup & activated the mg7550 2 days ago via xfinity app and internet/WiFi worked. Note: app said it was only a modem - vs. a modem/router which is an approved xfinity equipment. Tech support could not explain this but system worked.

Now, today I am not getting internet/WiFi and nothing was changed. Have restarted equipment several times, changed to a different drop and reset to default settings- still no internet/WiFi. No outages in my area.

Any ideas? Solutions? I saw another post about the xfinity app not working with non xfinity router. Do I need to setup in a different manner?

Thanks for any assistance.