Xfinity Stream with Roku TV

Hello,  I am new to the Xfinity Stream App.  We recently signed up for Xfinity Stream.  We have one box for our main tv, and downloaded the Xfinity Stream app on our other tv's that have Roku on them.  We can access the Live TV Xfinity Stream guide on our main tv, but  not on the Roku tv's.  We can see it, but once you click on one of the channels, it displays a message that there is a problem.  I wonder if we need to have a specific Roku Streaming Stick for it to work?