By default, it takes up to 30 minutes for your Active Directory changes to synchronize to Azure AD.
In many cases, this is inconvenient, e.g., if you configured a new mail alias on proxyAddresses for a user, the user might want to start using the new alias immediately.
To force Azure AD Connect to synchronize changes to Office 365 immediately, you can use AD Users & Computers or PowerShell.
Force Azure AD Connect Synchronization Using AD Users & Computers
The easiest way to force a synchronization of your AD changes to Azure AD is to use AD Users & Computers.
You must have Easy365Manager installed for this to work.
After making the changes to your user account that you want to replicate, simply select the check box in the bottom right corner on the Office 365 tab:
After clicking Apply or OK, an Azure AD Connect synchronization is immediately triggered.
If you don’t have Easy365Manager installed, you can download a free 30-day trial here.
Force Azure AD Connect Synchronization Using PowerShell
If you don’t have Easy365Manager installed, you need to run a PowerShell CmdLet on your Azure AD Connect server to force the synchronization.
Either log in to your Azure AD Connect server or create a remote PowerShell session using the following command:
Enter-PSSession [AADC Server]
Once connected to your Azure AD Connect server you can force the synchronization using the following command:
Start-ADSyncSyncCycle -PolicyType Delta