Comprehensive Detailed Explanation with References
Exact Data Match (EDM) classifiers are designed to identify highly sensitive structured data (like customer IDs, account numbers) with higher accuracy.
EDM classifiers can only be used within Data Loss Prevention (DLP) policies in Microsoft Purview.
They cannot be used in Insider Risk Management or Retention policies.
Reference: EDM classifiers in Microsoft Purview
"EDM sensitive information types can only be used in data loss prevention policies."