@timsheets13
It's no longer recommended to you an active directory with vCenter. You should use LDAPS or even better ADFS for authentication.
Did you follow the guide? https://docs.vmware.com/en/VMware-vSphere/7.0/com.vmware.vsphere.vcenter.configuration.doc/GUID-08EA...
From security perspective we are heading forwards in avoiding active directory authentication in any ways if not strictly required. You can see it in seperation of concerns. If an attacker gets compromised domain credentials, he will not be able to authenticate to your vCenter.
Regards
Daniel
