To force Office 365 DirSync, log into your server that has the Directory Synchronization tool installed.

Open up PowerShell and navigate to

C:\Program Files\Microsoft Online Directory Sync.”

Then start the Directory Sync Configuration by typing

“.\DirSyncConfigShell.psc1”

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Now that will open the DirSync Powershell, Then type the below

“Start-OnlineCoexistenceSync”

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After this open the MIISCLIENT from

C:\Program Files\Microsoft Online Directory Sync\SYNCBUS\Synchronization Service\UIShell\miisclient.exe

and check that it says Success under Operations

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You Can also check in the portal after that