Window Azure AD Connector : Group Membership.

Group membership of on-premise not sycing to Office 365.

Sometime the membership to the group on-premise will not match to the number of membership to the group in O365. There could be numerous reason the number will not match, are all the member to the group on-premise present in Azure AD ? 

If all the member to the group are present in Azure AD and still not member to the group in O365. check the membership of the group in  Azure AD and in EXO.

Determine the group member count in Azure AD

1.  Connect to MSOL (connect-msolservice)

2.  Run get-msolgroup -searchstring "GroupName" | foreach {(Get-MsolGroupMember -GroupObjectId $_.objectid.guid).count}

Determine the group member count in EXO

1. Connect to Exchange online shell
https://technet.microsoft.com/en-us/library/jj984289

2. Run (Get-DistributionGroupMember "GroupName").count

  If the count is different, there is no option left with us to fix it,Raise a case with Microsoft and they will sync the group membership at backend. 

Happy New Year to All .