We have two vRA 7.6 Business Groups with nothing in de Active Directory Policy field.
Let's say BG-1 and BG-2.
For each BG, there is a blueprint to deploy a VM, based on Cloning. They both have the same vCenter VM Template and the same Customization Spec entered in the blueprint.
Now, when we deploy a new VM from BG-1, the VM is deployed and joined to the AD, based on the Cust.spec.
When we deploy a new VM from BG-2, the vRO workflow "Add Machine to active directory (Event Broker)" throws an error:
No policy with id 'null' found. Error: InternalError: Invalid argument. (Dynamic Script Module name : getPolicyConfig#4) (Dynamic Script Module name : getPolicyConfig#6)
Note that for BG-1, this workflow is not even started. While for BG-2 it is called and failed due to no policy.
And also, there is no manually created Event Broker Subscription that calls that workflow.