| Schema extensions |<ul><li>String-type extensions can have a maximum of 256 characters. </li><li>Binary-type extensions are limited to 256 bytes.</li><li>Only 100 extension values, across *all* types and *all* applications, can be written to any single Azure AD resource.</li><li>Only User, Group, TenantDetail, Device, Application, and ServicePrincipal entities can be extended with string-type or binary-type single-valued attributes.</li><li>Schema extensions are available only in the Graph API version 1.21 preview. The application must be granted write access to register an extension.</li></ul> |
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