When attempting to join your vCenter appliance to AD, you may get the following error message when clicking the Join button:

Error
java.lang.reflect.InvocationTargetException

This is known behaviour when running vCenter with an external Platform Service Controller (in HA mode) but the issue may persist even after upgrading vCenter to a new version with the option to switch to an embedded PSC. You can work around the issue by performing the domain join from the CLI (through SSH):

Connect to the vCenter appliance through SSH (if it's still an external PSC, connect to that instead).

Unless shell access is already activated, use the shell command to enter the regular shell.

Run the followin  ...