Welcome to the Xfinity Forum and thank you for posting your question here. We apologize that you have been experiencing issues using the Xfinity Stream Beta app with your Roku device. Without knowing the details of the Roku device you are using or your account I can tell you that the Xfinity Stream Beta App is available on the following Roku devices:
Note: Devices must be on minimum firmware version 8.1 b1 or higher. The Xfinity Stream Beta channel will only appear in the Roku channel store for eligible devices.
Xfinity customers are eligible to use the Xfinity Stream Beta App on Roku devices if they meet the following requirements:
If your Roku device and Xfinity account meets the eligibility requirements you can learn more about activating the Xfinity Stream Beta App on your Roku device by following the directions outlined here: https://forums.xfinity.com/t5/TV/ANSWERED-What-is-Xfinity-Stream-on-Roku-and-how-does-it-work/ta-p/2...
Based on the image you posted, it does not look like you currently subscribe to Xfinity TV service. We are happy to help you make changes to your account to ensure you are eligible to use the Xfinity Stream Beta app on your Roku device. If you have additional questions or need anything else please don't hesitate to let us know.