Can't access a channel

My log-in is my Xfinity ID. The other TV is not cable.  It has  Chromecast. I have often watched the Hallmark channels through Chromecast on that TV with no issue. The app that I tried on my phone was the Hallmark app. I got the same nessage there as I did through Chromecast, that those channels were not part of my cable subscription even though they are. I CAN stream to that TV using the Xfinity Stream app, so I can access them now. I simply do not understand why I can no longer just do so through Chromecast without using the app. What changed?  

@cat2752 to confirm, you can use the Xfinity Stream app and Chromecast, but you can not use the Hallmark and Chromecast, correct? 

Yes, that is correct.

Thank you so much for this information.

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