De authorize an app on a Roku TV

I had a Roku TV at my cabin and within the TV I installed the Bally Sports app and then I authorized the use of the app by authenticating my Xfinity account. The issue is that I would like to de-authorize the use of my Xfinity credentials for the Roku TV that I installed the Bally Sports app on.  I can go into security in settings and see recent activity but I don’t see any indication of where to check what devices are using my Xfinity authorization. Please advise