Hello, @IniobongNkanga-8038,
Welcome to the Microsoft Q&A platform!
Based on your description, I understand that you have issue where you are Unable to view DLP alerts from mail notification and get an error message showing “Either what you are looking for doesn't exist or you need to use a different search string.”.
If you haven't already tried using the direct entry method for the destination URL, try clicking on https://compliance.microsoft.com/compliancealerts first to directly find the correct location for your alerts.
If you still receive the same error message, please consider:
- Create a custom policy as a copy of the default one that should have correct URL.
- Looks for alert in Compliance/Purview.
- If the URL from the alert ID starts with "fa" eg. https://security.microsoft.com/alerts/fa1234512345 simply remove the "fa" like this: https://security.microsoft.com/alerts/1234512345.This way the alert will open in Security Admin Center.
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Thank you for your support and understanding.
Best Wishes,
Alex Zhang