Hello, I am having the same problem. I just changed my service plan over the phone, and I was looking at my account while I changed it with the representative. But since the account update, I get this warning every time I try to go to xfinity.com:

Access Denied

You don't have permission to access "http://www.xfinity.com/sitecore/api/learn/neptune/customer/existing/postauth?" on this server.

Reference #18.9e293417.1761242210.1ddee86a

https://errors.edgesuite.net/18.9e293417.1761242210.1ddee86a