Xfinity stream live TV

No access to live TV on Xfinity stream anymore. We used to be able to watch live TV, all of our local channels. Now it says not included in our plan Error TVAPP 00500. I have chatted with 2 different live agents. The first said they would reset or refresh app and we should be good on 60 minutes. Didn't work. Second one said it must be a Roku problem. I'm seeing online that other people have the same problem. It was working fine until we got a Xumo box, then there were no local channels. I returned the box for this and other reasons. Now we can't get any live TV. Please figure out why. I am paying for local channels. Thank you