Unable to connect to "Xfinity Mobile" WiFi network

I am an Xfinity Mobile customer and also have Xfinity home internet.

Since moving to a new phone (Google Pixel 11 Pro) at the end of August, I have been unable to connect to "Xfinity Mobile" WiFi networks. In the phone's WiFi settings, "Xfinity Mobile" networks appear, and say "Available via Xfinity Mobile" in the text underneath the WiFi name. When I try to connect to one of these networks, it thinks about it for a bit, but then says "Authentication problem"

I have the Xfinity app installed on my phone, and have tried going to WiFi > WiFi Hotspots (following the instructions from https://www.xfinity.com/support/articles/about-xfinity-wifi-internet) however the option to "Connect automatically", then "Auto-connect now" does not appear in my app (step 3 under the "How to connect" section).

I have tried uninstalling and reinstalling the app, turning my phone off and on, and even turning my Xfinity Mobile eSIM off and on again.

Interestingly (though maybe unconnected), I noticed that my phone does not appear in the list of Xfinity Mobile devices connected to my home WiFi (WiFi page in the app > Connected to your WiFI > Devices > Xfinity Mobile shows 0 devices).

Any advice appreciated. Chatting with agents has not yet yielded any results.