I'm trying to connect to xfinitywifi on my home computer, but it says cannot connect to this network no matter where in the house I am.
It's the same for me. For several Windows 10 and Linux machines. Also, cannot connect on the Google Pixel phones or even iPad tablets that I have. It's been like this for a couple of weeks now. Was able to, then all a sudden, I can't.
Looking through the forums, it appears to be an ongoing issue. Likely the "owners" of those hotspots need to reboot their equipment, but don't since they don't have an issue so why would they? And Comcast/Xfinity doesn't care, so calling them will do zero.
Good luck and I hope it comes back, for you and for me.