When we try to add delegation to a specific user in Active Directory Users and Computers and we receive this error:
The following Active Directory error occurred
You should do this:
You need to go to the domain controllers group policy:
Open the Group Policy Tab:
Expand “Default Domain Controllers Policy->Computer Configuration->Windows Settings->Local Policies->User Rights Assignment” and locate the “Enable computer and user accounts to be trusted for delegation”:
Open this Policy and add the group or user who should have rights to add delegations:
After this, you can try again and you should have no problems adding delegation to the user.