Hi @robin7,
Thanks for getting in touch. We understand that you are unable to pay on Paramount Plus through Roku. We're happy to assist.
Kindly ensure that the email address linked to your Roku device is your previous one. You can check it in Settings >> System>> About. You can also check if you have an active subscription by logging into your Roku account online at my.roku.com and clicking "Subscriptions."
Moreover, you can refer to this support article on how to update the payment method on the Roku account.
We hope this helps. Please let us know if you need further assistance.
All the best,
Janadee
Nadee K.
Roku Community Moderator