In this article, we shall discuss how to fix the Synchronization service scheduler is suspended until the setup wizard is closed. Azure AD Connect sync which is now referred to Entra ID Connect sync synchronize changes occurring in your on-premises directory using a scheduler. Please see “BitLocker Windows Update Shutdown or Reboot option behavior“, and How to update the BIOS on your Dell system.

There are two scheduler processes, one for password sync and another for object/attribute sync and maintenance tasks.

The scheduler is responsible for two tasks:

Synchronization cycle: The process to import, sync, and export changes.
Maintenance tasks: Renew keys and certificates for Password reset and Device Registration Service (DRS). Purge old entries in the operations log.

Please see “VMware Workstation states: What are the differences between Suspend, Power Off, and Run in Background“. Also, see How to sync on-premises AD with Azure AD via Azure AD Connect.

synchronization service scheduler is suspended

Furthermore, this behavior is because synchronization is currently ongoing. And you have opened Azure AD Connect to make changes, as we can see below.

However, This is because the system thinks new changes will be made.

Even when the AD Connect Status command is launched via PowerShell, it returns nothing

Moreover, To resolve this issue, simply close the Azure AD Connect Tool and rerun the synchronization from the command-line interface or from the service as shown below.

Launch the AD Connect Synchronisation Service from the start menu

This will open the Synchronisation Service Manager Window and runs every 30 minutes by default.

Now we’re just forcing the synchronization and clicking on run

There are two types of Sync available in the AD Connect tool: Delta Sync and Full Sync. Nonetheless, each one of these types has its own scenarios, and it’s will replicate the changes to Azure Active Directory.

Delta synchronization is used to replicate the new changes made
In the full synchronization (Synchronization cycle): this will be used to import, sync, and export all changes.

Maintenance tasks: Renew keys and certificates for Password reset and Device Registration Service (DRS) in addition to deleting the old log files.

To force Delta sync to be run Immediately via PowerShell, open the PowerShell with administrative privilege and run below command.

Start-ADSyncSyncCycle -PolicyType Delta

I hope you found this blog post on how to fix Synchronization service scheduler is suspended until the setup wizard is closed helpful. Please let me know in the comment session if you have any questions.