Importance of "Everyone", "NT Authority\Authenticated Users", "Active Users" in the site collections

 Hi folks,

I've gone through an issue user is not able to create a new page even if all the mandatory fields belonging to the page are filled.

Actually, there are some fields of type "Managed Metadata" who value got wiped off till the page is checked in or metadata is saved.

On troubleshooting, I got to know that the permissions of hidden list (TaxonomyHiddenList) for managed terms got broken. As I deleted "Everyone" at site collection level, it is removed from every where. Hence, managed terms are not accessible and whenever user is trying to check-in the page an error of - "You must fill out all the required properties before completing this action."

I navigated to "TaxonomyHiddenList" and granted 'Everyone' group read permissions to the list.

Thanks,

Kunal