Hi flavio,
Thanks for your post. Based on my research, you can start by reading Group Policy events recorded in the system event log.
- Warning events provide further information for you to follow to ensure the Group Policy service remains healthy.
Error events provide you with information that describes the failure and probable causes.
Use the More Information link included in the event message.
Use the Details tab to view error codes and descriptions.
Use the Group Policy operational log.
- Identify the activity ID of the instance of Group Policy processing you're troubleshooting.
Create a custom view of the operational log.
Divide the log into phases: pre-processing, processing, and post-processing.
Consolidate each starting event with its corresponding ending event. Investigate all warning and error events.
Isolate and troubleshoot the dependent component.
Use the Group Policy update command (GPUPDATE) to refresh Group Policy. Repeat these steps to determine if the warning or error still exists.
For the applying policy failed troubleshooting issue, you can refer the following guide:https://learn.microsoft.com/en-us/troubleshoot/windows-server/group-policy/applying-group-policy-troubleshooting-guidance
Best Regards,
Ian Xue
If the Answer is helpful, please click "Accept Answer" and upvote it.