Hi @Karen297 and welcome to the forum.
If you have just moved from Sky Q or any other Sky product to Stream all your Marketplace subscriptions are cancelled so you have to re-register (see the THIS link)
You can register or re-registered (as appropriate) by doing the following: Use the voice command "My Sky" and then select the following: your products / (enter your PIN) / App Subscriptions / Current / and then Paramount + Monthly. Hopefully it will say £0 per month as you have Sky Cinema. If so select Activate subscription.
Also, see the following link:
https://www.sky.com/help/articles/sky-marketplace-subscribe-to-paramount-plus
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