Xfinity oauth.xfinity.com blocked for no reason

I've only derived that it's oauth.xfinity.com because that seems to be where it stalls. When I try to log into my xfinity account while on my wifi, it just spins and never loads. It eventually times out. It's an issue I've see several talk about on these support forums: Search results here

Last time it happened to me it was the security app that was causing the issues and netgear admitted that. The fix was to reset to factory and setup my mesh system as new. It was a pain but it was the only fix. I'm afraid it might be the only fix now, too.

If I switch off wifi on my phone and use cell networks, I log into xfinity just fine and the xfinity stream app works. But any device using my network is unable to use xfinity stream or log into the xfinity website. I also can't authorize other apps like ESPN while on my network, so I have to go to cell networks, login to xfinity, authorize the connection, then ESPN works.

It's just strange this time since I've made no changes to my system so it makes no sense as to why it would suddenly cause the issue. I know "a" fix, I'm just hoping for a more attractive fix and better yet, a solution to the problem that avoids it being an issue in the future.