Xfinity Stream App "not found" in the app store on one of my Samsung TV's

I have several Samsung TV's bought the last 5 years, and I just loaded the XFinity streaming app on all of them... except one. On one of them, when I search in the TV's "app store" the XFinity Stream app isn't showing up as available. Based on my model (UN82MU8000) and software version (T-KMAKUC-1401.1. BT - S), it should be compatible with the app. How do I get this rectified?