October 2021
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After configuring Azure AD Connect to sync my on-premise Active Directory users to Office 365, I wanted to force a sync to Azure, here’s the PowerShell command.

Start-ADSyncSyncCycle -PolicyType Initial

Start-ADSyncSyncCycle -PolicyType Delta

Using the Initial option will force a full sync of the directory.
Using the Delta option will only sync the changes from the directory.

Note that an ‘Initial’ sync will take a little longer to process than the ‘Delta’ option.

Tip: Use the ‘Synchronization Service Manager’ to monitor the sync progress.