User accounts and user groups

An enabled Windows-linked account shows as disabled

I cannot add Windows-linked accounts

I cannot create an account because it already exists, but it is not visible

I cannot disable or delete a particular user account

I cannot enable a deleted user account

I clicked Security, but I cannot add users or groups

I deleted the Authenticated Users group from the directory

Windows users are gaining access without having accounts

Recreating deleted accounts does not restore permissions

Unable to grant full access to the Network Directory