So I just fixed it by trying to link to Xfinity through a VPN so it was not automatically verified as an Xfinity account by detecting my Xfinity IP address. Then I noticed that Xfinity was requiring that I change my password. After I did this the Roku authorization went through.
What a freaking pain. I hope this might help someone else.
Cloudpath authorization errors deal with channels that require authentication to a TV provider account and use the Cloudpath service to manage this authentication. The NBC/Universal family of channels are known to user Cloudpath, I don't know if others do.
One thing that some have reported fixes this is going into the channel on your Roku, logging/signing out, then logging/signing back in again and authenticating with your TV provider credentials. If this fixes the problem for that channel it typically fixes it for all channels in that family that use Cloudpath authentication.
