You must create a user account in 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 varies, depending on whether you use VMware Horizon 8with or without instant clones. See Configuring User Accounts for vCenter Server and Instant Clones.