If you search the "Streaming Store" for Paramount you'll see two options. Add the one without "RokuChannel" on its icon and you'll be able to sign in when you launch it. You'll want to cancel your subscription to the other one on https://my.roku.com.
Roku Community Streaming Expert
Help others find this answer and click "Accept as Solution."
If you appreciate my answer, maybe give me a Kudo.
I am not a Roku employee.
