Channel 1254 not enabled on my Comcast account in Atlanta

My Xfinity plan includes BravesVision channel 1254.  However, when I tune to that channel I get a message “channel unavailable “.   I called Comcast/Xfinity and the first representative confirmed I am authorized for the channel but she said since my equipment uses Cablecards that might be the issue.  She suggested downloading the Xfinity Stream app to watch channel 1254. I did this but I get a new error message “connect to your in home WiFi to watch this channel “.   I am connected to my in home WiFi so I called back.  The representative said since my in home WiFi is through AT&T she couldn’t help me.   Doing a Google search revealed that the problem is likely with Comcast not having my WiFi correctly provisioned.  The search result suggested unplugging my router and dining out of Xfinity Stream then re-plugging in the router and signing in to Xfinity Stream.  I did this but it did not work.  It doesn’t seem right that Comcast would require me to subscribe to their internet in order to troubleshoot this issue and it also does not seem right that the channel is unavailable on my Xfinity cable service