You need to be an admin of the page you want to stream to.
You’ll need a paid Restream plan to unlock streaming to Facebook pages.
If your Page is recently created, Facebook might restrict streaming on it until it becomes more established.
How to Add a Facebook Page
Connect Facebook to Restream following these instructions.
What if I don't see my Facebook Page on the list?
Make sure you're an admin or editor of the Facebook page in order to connect it to Restream.
You can check by going to Facebook and clicking Pages in the left menu.
Go to your Page and click Settings at the bottom left.
Click Page Roles in the left column. From here, you can see your role listed below your name.
You may not have granted permission for your specific page.
Removing and re-adding the Facebook channel should fix that. Please ensure you grant access and check the boxes next to all groups and pages that you'd like to stream to.