Hi,
I have no 6.7 in place, but you followed this, correct?
https://docs.vmware.com/en/VMware-vSphere/6.7/vsphere-esxi-vcenter-server-67-availability-guide.pdf
At page 77 it says:
"
Procedure
1 Log in to the Active node with the vSphere Web Client.
2 Right-click the vCenter Server object in the inventory and select vCenter HA Settings.
3 Click Configure.
4 Select the Basic configuration option and click Next.
This option is available only if your environment meets prerequisites for the Basic option.
"
Did you followed this?
Also, important the bold words, with the prerequisites described in previous pages of the doc...
HIH in some way,
Gianluca
