Microsoft 365 E5 is correct because it includes the advanced Microsoft Purview Data Loss Prevention capabilities required to create and manage custom sensitive information types.

Custom sensitive information types are an advanced compliance feature in Microsoft Purview and they require an E5 level license or an equivalent compliance add-on. The E5 subscription provides the necessary DLP and sensitive information type tooling so administrators can author, test, and deploy custom pattern matches and classifiers across Microsoft 365.

Microsoft 365 E3 is not sufficient because it offers basic DLP and information protection features but does not include the advanced Purview capabilities for creating custom sensitive information types.

Microsoft 365 Business Premium targets small and medium businesses and does not include the advanced compliance and DLP tooling required to define custom sensitive information types.

Office 365 E1 is an entry level plan that lacks the advanced DLP and Purview compliance features needed to create custom sensitive information types.

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