Welcome to the Roku Community, @MTjack!
It seems like you are having issues with accessing your Paramount Plus subscription. No worries! We'll help you find the best resolution possible.
Before we proceed, are you accessing this directly from the standalone app of Paramount Plus? Were you able to see this app on your other Roku devices? Additionally, are you able to search for it under the Streaming Store?
In the meantime, please try rebooting the affected device by navigating to your Home screen. Scroll up or down to select Settings > System > Power (skip if unavailable) > System restart to see if this makes any difference.
We'll be anticipating your response.
Best regards,
Carly
Carly Y.
Roku Community Moderator