A DLP policy can be configured to allow users to override a policy tip and report a false positive.

You can educate your users about DLP policies and help them remain compliant without blocking their work. For example, if a user tries to share a document containing sensitive information, a DLP policy can both send them an email notification and show them a policy tip in the context of the document library that allows them to override the policy if they have a business justification. The same policy tips also appear in Outlook on the web, Outlook, Excel, PowerPoint, and Word.

If you find that users are incorrectly marking content as false positive and bypassing the DLP policy, you can configure the policy to not allow user overrides.