You must create a user account in Microsoft Active Directory to use with vCenter Server. You specify this user account when you add a vCenter Server instance in Horizon Console.
You must give the user account privileges to perform certain operations in vCenter Server. You can create a vCenter Server role with the appropriate privileges and assign the role to the vCenter Server user. The list of privileges you add to the vCenter Server role depends on whether you use Horizon 8 instant clones. See Privileges Required for the vCenter Server User Without Instant Clones or Privileges Required for the vCenter Server User With Instant Clones.