I have a Paramount Plus account that I subscribe to. I subscribed and am currently accessing it through my Amazon prime account. In Roku I have a Paramount Plus app installed and when it asks me for login information I put in my credentials that I use when accessing from Amazon Prime. It doesn't recognize it and wants me to subscribe again. How do I access my current Paramount Plus through the Roku Paramount Plus app? Or is it even possible? Please advise. Thank you!
If you're accessing it through your Amazon Prime account then you may be able to access it through the Amazon Prime channel/app on Roku (if it's available there), but unless you have a subscription directly with Paramount (or through Roku) I don't think you'll be able to access it through the Roku Paramount+ channel/app.
In general if you don't have a subscription directly with the provider there are limitations to where that subscription can be accessed. A subscription to Paramount+ through Roku wouldn't be available on an Amazon Fire device, for example, but a subscription directly with Paramount (CBS Interactive) could be used on any device that has a Paramount+ app.