Can't Change a Security Group to a Distribution Group


I'm trying to change a Security Group to a Distribution Group in AD.

It seems to work, but then changes back to a Security Group again.

Is there a way to force it?

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Of course you should be logged in with a domain admin.  I would also suggest doing this action on whichever Domain Controller is hosting the PDC Emulator FSMO role.
Do you have Exchange in your environment? If so, a DG will be automatically converted to an SG if someone grants the DG permissions to a public folder or another object within Exchange.  There is no way to prevent this that I am aware of (though others may offer a method that I'm not aware of), outside of educating users to only grant permissions on PFs using security groups.

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