Allowed
blocked, but the user can override the policy
1. If a user attempts to upload a document to a Microsoft SharePoint site, and the document contains one UK passport number, the document will be: allowed Explanation: When setting the policy tips and notifications, the document won't be blocked, it just shows a policy tip, if you set up this policy yourself, you will see there are no (block) actions configured for this rule.
2. If a user attempts to email 100 UK passport numbers to a user in the same company, the email message will be: blocked, but the user can override the policy
https://docs.microsoft.com/en-us/office365/securitycompliance/data-loss-prevention-policies