Xfinity Stream app forcing plan purchase

I have Internet service with Xfinity, and access to Xfinity Stream is included.  I can "watch TV online" (https://www.xfinity.com/stream/) through a browser without a problem, but logging in through the Stream app (via xfinisty.com/authorize process), the app forces me into a plan purchase routine (at +$48/mo), rather than recognizing that streaming is included with my current service.  The app behaves this way on multiple TVs, which meet the requirements.  Feels like an account issue.  Any ideas on how to solve?