vCenter HA Error Causes a Failure to Update VCSA. This is how to fix the issue.

Attempt to resolve the connectivity problem. If you can restore connectivity, isolated nodes rejoin the cluster automatically and the Active node starts serving client requests. If you cannot resolve the connectivity problem, you have to log in to Active node’s console directly.

1. Power off and delete the Passive node and the Witness node virtual machines.
2. Log in to the Active node by using SSH or through the Virtual Machine Console.
3. To enable the Bash shell, enter “shell” prompt.
4. Run the following command to remove the vCenter HA configuration.
5. Type:

vcha-destroy -f

VMware KB suggests rebooting the vcsa however the update will succeed without a reboot. Reboot when convenient.