Cannot use the Xfinity app to log in, but can use firefox browser window to log into my account on the same phone

I cannot use the xfinity app on my Iphone SE 3rd Gen phone.  It is a two line phone, one esim ATT line and one sim card for an Xfinity mobile line.

When i try to log in using the xfinity app I get the following message:

Access Denied

You don't have permission to access "http://login.xfinity.com/login" on this server.

Reference #18.9e240f17.1788980826.54053dc

https://errors.edgesuite.net/18.9e240f17.1788980826.54053dc