Disallow setting primary group

Disallow setting primary group

Hi,
 
I want to let users add and delete group memberships within the OU I assigned to them.
The member of-field within single user adjustment works just fine except that I want to disable the set primary group button. I have tried several ways to disable this within AD delegation, but disabling this button seems not to be a feature (or it is not working as it should).
 
Can somebody help me with this?
 
Best Regards,
 
Tom  
 
 

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