There may be multiple reasons why a retention policy doesn't work. Could you please provide more detailed information?
Here are some common troubleshooting steps:
- Wait for the policy to take effect: It may take some time for a retention policy to take effect, usually 1 to 7 days. Please make sure you have waited enough time.
- Check policy configuration: Confirm that the policy and labels are configured correctly. Make sure the policy is correctly assigned to the target user and the label settings meet your needs.
- Verify user mailbox: Confirm that the retention policy has been correctly applied to the target user's mailbox. You can check the application of the policy through the Microsoft Purview portal.
- Check permissions: Make sure you have sufficient permissions to create and manage retention policies. If not, contact your IT administrator.
- Check error log: Check the error log in the Microsoft Purview portal for error information that may cause the policy not to take effect.
https://learn.microsoft.com/en-us/purview/retention?tabs=table-overriden
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