Delegated-Extensions-Open extensions Number of APIs: 3 Get an open extension GET https://graph.microsoft.com/v1.0/me?$select=id,displayName,mail,mobilePhone&$expand=extensions Create an open extension POST https://graph.microsoft.com/v1.0/me/extensions Update an open extension PATCH https://graph.microsoft.com/v1.0/me/extensions/{{ExtensionId}}