@Swit9-
When you subscribe to premium subscriptions through 3rd party systems like Roku, Amazon, Hulu, etc, your accounts are with that 3rd party acting as an agent for the channel, not with the channel itself. In your case, your Parmount+ account is with Roku, not Fire TV (i.e. Amazon). Although there are a few exceptions, these are typically only viewable via the 3rd party service through which you subscribed. In Roku's case, many are viewed via The Roku Channel.
If you want to view on all platforms supported by that channel you typically must subscribe directly with the channel via its web page then use its dedicated app for each platform, authenticating via the credentials you established with the channel account.
Personally, I subscribe to all my premiums directly with each channel. This keeps my viewing options open.
Roku Community Streaming Expert
I am not a Roku employee, only a user like you. Please, no support questions via private message -- post them publicly to the Community where others may benefit as well.
If this post solves your problem please help others find this answer by clicking "Accept as Solution.".
Ultra 4800 | Streaming Stick 4K+ 3821 | TCL Roku TV 43S245/C107X
