Hi, CARRIEB776! I'm sorry to hear that you are having an issue with the Xfinity Stream app on your Roku. I received your private message, thank you!
@CARRIEB776 - I haven't received a reply for 7 days and I'm closing this thread. If you still have an issue with the 403-102 error or any other questions - please feel free to send me a private message.
Have a wonderful day!