I have escalated your issue to the Comcast Team available to these forums. Check back often for a reply in this thread from a Comcast Official Employee.
Hi there, tlashongreen. Good morning, I hope you are doing well! It's frustrating to hear about your troubles with our Stream app on your TV. Was it working for on demand previously and then it just randomly stopped? Did you make sure to sign out before deleting and reinstalling the app? It sounds like we may need to open a request for you, to have this looked into further. We can help you with that right here, so you came to the right place! Which model of Samsung Smart TV do you have?