I have a second campaign and my players cant access any of my paid books

Is content sharing turned on for your second campaign?

how do I even check that? sorry I am really new to beyond

For starters, on your "my campaigns" page, there should be a blue box that says "content sharing enabled by [user name]."

I see the link I can copy to have people join and then their characters, I don't see a blue box other than the notes section at the bottom

So content sharing is off then. Only an account with a master tier subscription can enable content sharing on a campaign.

Here is a link to a buyers guide thread that covers the benefits of buying different books and subscriptions. And a link to the subscription page.

https://www.dndbeyond.com/forums/d-d-beyond-general/general-discussion/13989-a-buyers-guide-for-d-d-beyond

https://www.dndbeyond.com/subscribe

If you have any other questions feel free to ask.