When I first installed the new AADSync tool, I struggled to figure out how to force a synchronisation. In the first release of DirSync, you would use the following commands from an Administrative CMD prompt to force a sync:
cd "C:\Program Files\Microsoft Online Directory Sync" .\DirSyncConfigShell.psc1 Start-OnlineCoexistenceSync (optional: -FullSync)
Then DirSync was upgraded to version 6862.0000 and the process changed. First you opened a Powershell prompt (as Administrator, of course) and then ran:
Import-Module DirSync Start-OnlineCoexistenceSync (optional: -FullSync)
In the new AADSync tool, the process has again changed. There is now a task in Task Scheduler called Azure AD Sync Scheduler which controls the running of the AADSync tool. The FullSync parameter used to force a full synchronisation, but you now use the Initial parameter to do this. You can force a sync by opening an Administrative CMD prompt and running:
cd "C:\Program Files\Microsoft Azure AD Sync\Bin" DirectorySyncClientCMD.exe delta (optional: initial)