Captive portal issue with home network

Earlier today, I started getting a pop up in the lower right hand side of my screen that said action was needed for wifi and to select to open the browser and to connect. When I clicked that, it opens up the URL http://www.msftconnecttest.com/redirect in my browser that shows a page that says "This device is paused. To resume access to the Internet on your home network, open the 'Xfinity xFi' app". When I check in the xfinity app, I can see my devices (this is happening on both my work computer and my personal computer) listed as "Connected to Gateway" and I have options to pause the device or to troubleshoot. If I troubleshoot, it says that I have a strong connection. I am also getting various errors that refer to a captive portal. My work VPN will not connect if I am using my home network wifi because it says that a captive portal is detected, although I can sign in from xfinity mobile hotspot with no issues. My personal computer will periodically redirect me to https://support.mozilla.org/en-US/kb/captive-portal and has a message that I need to log in to this network before I can access the internet.

I am signed in to my home wifi network on both computers using the same credentials that I have always used, neither computer is new and I am not aware of any changes. Despite the various errors that pop up, I am still able to access the internet on this network on both computers, although I cannot do anything that requires VPN on my work computer.

I have tried, in no particular order and multiple times for some steps:

• unplugging the Gateway and plugging it back in
• pausing and unpausing both devices in the xfinity app
• checking my settings on the xfinity app and on 10.0.0.1
• setting my network name to not broadcast
• forgetting both devices in the xfinity app and then reconnecting them
• forgetting my home wifi network on both computers and then reconnecting it
• turning the "Advanced Security" off
• restarting both computers
• restarting the Gateway
• doing a factory reset on the Gateway

I also called the xfinity customer service line and spent an absurd amount of time getting transferred between five different people, which included multiple call backs and rounds of being on hold before "authentication" processes where I had to repeat my name, address, and telephone number, and then give them a OTP that they texted to my phone, and then reexplain the entire issue from the start before they started basic "have you tried turning it off and turning it back on" for the Xth time.

I have read through a few forums and it sounds like this might be an issue with my router settings. Has anyone else experienced anything similar?