If you use Office 365 or another Microsoft Online Service, you may be using Microsoft Windows Azure Active Directory Sync Tool. This tool allows your local on-premise Active Directory to be synced with the Windows Azure Active Directory (Azure AD). The Sync Tool syncs local changes to the attributes of users, groups, and mail contacts to the cloud (does not sync cloud to local) every two hours. You can speed up the process by forcing the sync. Follow these steps to force a sync:
1. Log on to the server that has the Windows Azure Active Directory Sync Tool installed using a member of the local admin group
2. Use File Explorer to navigate to C:Program FilesMicrosoft Online Directory Sync
3. Click on DirSyncConfigShell.psc1
4. Once the Powershell window opens, type Start-OnlineCoexistenceSync
5. Hit the Enter key and the sync should have started