adding member to dynamic distribution group in outlook

I have been trying to lookup how to add a new member to a dynamic distribution group, I came upon this, but it doesn't work...I think there is some other function because this seems to be for regular groups:

Add-DistributionGroupMember -Identity "g1white students" -Member admin@live.cndl.edu

the dynamic group has been created using:

New-DynamicDistributionGroup -Name "g1white students" -alias g1whiteStudents -RecipientFilter {(RecipientType -eq 'UserMailbox') -and (CustomAttribute2 -like 'G1') -and (CustomAttribute3 -like 'White')}

how can I add the admin to be part of the people in the dynamic group,

what I ultimately want is that the admin receives a c开发者_如何学JAVAopy of the emails sent to the group I have already added permission for admin to be able to send emails to the group using:

 Set-DynamicDistributionGroup  "g1white students" -AcceptMessagesOnlyFromSendersOrMembers "g1white students","admins"

(where admins is a ddg that contains the list of people allowed to send emails to all groups)

Dynamic Distribution Group members are auto calculated based on the filter and conditions you set. I imagine that the admin needs to set the attribute that you know is being filtered for the distribution group.