Purview DLP Behaviours in SharePoint and OneDrive

We are currently testing Microsoft Purview DLP policies for user awareness across SharePoint Online, and OneDrive. The policy is configured such that sensitive information (based on a sensitivity label-OFFICIAL Sensitive) shared externally triggers a policy tip, with override allowed (justification options enabled) and no blocking action configured.

In SharePoint Online and OneDrive, users are not experiencing any DLP-related behaviour. When attempting to share labelled content externally:

• No policy tips are displayed
• No override prompts are presented
• No indication of DLP enforcement is shown

Users are able to share content externally without any awareness prompt or restriction.

Sharing in OneDrive/SharePoint

Expected behaviour:

• Users should receive a policy tip during the sharing process
• Users should be prompted for justification when overriding, aligned with the DLP configuration

Has anyone observed similar behaviour with DLP in SharePoint Online and OneDrive, particularly in scenarios where no blocking action is configured? Keen to understand if this is expected behaviour, a known limitation, or if there are any configuration considerations or workarounds to achieve a consistent user experience across workloads.