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Title
Error when modifying a mail enabled Universal Security Group. -
Description
On a mail-enabled Universal Security Group, when you check the box under Message Delivery Restrictions to enable "Require that all senders are authenticated", you get a popup error:
"Administration Policy returned and error. Members can't remove themselves from security groups. Please set the group to Closed for requests to leave."
Does not affect Universal Distribution Lists.
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Resolution
Set the MemberDepartRestriction to closed for that distribution group.
set-distributiongroup <alias of group> -memberdepartrestriction closed