Hi,
I have a scenario that publishes in 3 different facebook pages.
Sometimes, it publishes on the first FB page, and then on the second I get that error “A security check is required to proceed. (368, OAuthException)”.
If I go to my pages and publish manually, there is no problem.
Do you know what is happening, and how I can avoid the error ?
Hi there,
This error originated from Facebook itself and generally, it tells the content you’re trying to share includes a link that our security systems detected to be unsafe. This error indicates that Facebook has flagged the link or image in your post as unsafe.
We will have not much broader view of this with any error subcode you see ( generally error code is connected with the subcode too)
I will suggest you reach out to Meta Community here and see what they have to say.
i hope this at least point you in the right direction! 
If this was the problem, I would not be able to manually post the same content, right?
When I get the problem, manual posting on FB works with no problem.