@Geno11x11 Thanks for the post!
I get that you're looking to get the IP Camera Viewer Pro subscription on your Roku. Just like @JWS9518 said, if all your Rokus are tied to the same email account, one subscription will cover them all.
Additionally, verify the subscription credentials are correct. You can do this on your Roku device by navigating to Home > Settings > System > About.
Hope this helps!
The Roku Community Team
Jharra Q.
Roku Community Moderator