Internet storm outage. Can't use xfinity streaming app on Roku using cell phone Hotspot.

My xfinity wifi is down due to an internet outage in my area due to the ice storm. I am having to use my cell phone Hotspot to connect to the internet while I wait. I can't use the xfinity streaming app on Roku connecting through my cell phone Hotspot because it says I can only use it on my home wifi connection. Is there any way I can use it with my cellphone Hotspot on my TV using roku until the xfinity outage is resolved? At least that way I can watch cable TV I am paying for and get local news until the storm outage is resolved.