Monumental sports app help!

Hi! I have a monumental sports subscription thru Roku ( it shows up on my subscriptions in my account) and I’m unable to watch the live capitals hockey games. I just bought a new Roku 4K express and logged into my  Roku account and to the sports account. Roku recognizes the subscription, but the app does not. In the app it won’t allow me to watch the games without a “active subscription”. Here’s the kicker- my other Rokus work fine with this app and allow me to watch no problem. I cannot delete the app on this Roku and I’ve tried to factory reset. HELP!