Can't see Network name

Weeks ago I tried to connect a Roku and today my new Canon printer, but I cannot connect to my own wifi as the network does not show up when searching, and when I try to enter the name and my password manually it fails to connect. Why is this?

My settings are to broadcast my network name but it is a WPN2 secure network. Using a gateway router provided by xfinity. Other devices are able to connect no problem: my iphones and laptops and smart tv are all fine and can see the network name...