
Hi @Jake Chan,
Please check if you have successfully installed the SharePoint 2016 Aug 2023 CU. You can go to Central Administration > Upgrade and Migration > Check product and patch installation status to manage the version.
After install the update, you will need to run wizard configration again. If the issue still exist after doing this, you could go to ULS log to get more information about the error
https://learn.microsoft.com/en-us/sharepoint/administration/view-diagnostic-logs
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