Windows service account management problem

Hello there.

I need to manage my domain based service accounts. I followed exactly the procedure written in help guide but it’s not working.

•(Done) Add the Domain controller as 'Windows Domain' resource type. Make sure that you specify the DNS name and Domain name.
• (Done) Add the domain administrator account to this 'Windows Domain' resource.
• (Done) Add the service account which is used as logon account to this 'Windows Domain' resource.
• (Done) Add each machine in which services are running as individual resource with resource type 'Windows'.
o Additionally I added a local logon account with admin privileges to this resource.
•(Done) Create a resource group which contains all these windows machines. For example: Service Account group.
•(Done) Click "edit" button of the 'Windows Domain' resource and select the domain administrator account which you added in the 'Supply credentials for remote synchronization' section. Refer to the screenshot below:
•(Not working) Click "edit" of the service account and move the resource group which you created to the box on the right side and save. Refer to the screenshot below:

Thanks in advance for your help