Sharing Calendar of Users in a Security Group

Hello all,

I have around 25 users currently in a mail enabled security group and we are trying to find a way to share the calendars of all users to join this group with another user.

I tried the general user to user sharing command of

Add-MailboxFolderPermission –Identity securitygroup@company.com:\Calendar  -AccessRight Editor -User headhoncho@company.com

This gave an error that I was expecting that the "Specified mailbox 'securitygroup@company.com' doesn't exist."

I know I can do a get-adgroupmember securitygroup to parse the users in the group, but I do not know how to forward the results of that over to the Add-MailboxFolderPermission command. 

Any help would be appreciated.