Add Group to Shared Calendar

I need to add multiple users to a shared Calendar.  I created a group and added all the users to the group.  When I open the Properties - Permissions tab on the Calendar and hit ADD I do not see my group I created.  I can find it in Active Directory just fine.  I created the Group as a Security group  - Universal.

Secuirtyt zgorupSecuirtyt zgorup
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In order to add a group to mailbox permissions, it will likely need to be mail enabled.  I'd just turn it into a Distribution group.
AmitIT ArchitectCommented:
convert it to DG as said above.

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