create AD user and create AD Group using System Center Orchestrator

Hi,

I have created a runbook on my System Center Orchestrator as following:

1. create AD User (it is working)
2. Enable AD User (it is working)
3. Enable Mailbox (it is working)
4. ADD the new created AD user to existing group (it is working)
5. Create a new AD group (it is working)
6. ADD the new created AD user (step 1) to the new created AD Group (step 5) ( does not work)

What do I wrong?

here my runbook

best regards

Nick