Bug in Discovery Manager v7.1 RA

I have DiscoveryManager 7.1 installed (Database setup with ES1_EM\Windows\ES1_DiscoveryMgrDbSetup.exe ) on a new environment of SourceOne.

While adding a new user by using the Administration panel, the following situation occurs:

1. First initial run of the DiscoveryManager Client on the Master Services server

2. Retrieving information from the server: OK, 'Connected' on bottom right.

3. Click on "Add.."

4. Select user by AD.

5. Press OK.

6. The following error appears: 'Item No longer exists. It has been deleted.'

7. When i navigate to the panel of My Matters and back to Administration the user is added to the users, as expected. I've did this step to do a 'refresh' of the Administration panel.

So the error message is wrong in this case.

Can somebody take a look at this issue?

Note: Removing a users is working as expected: