Lookup external tenant id (notes)

Requirements: Authorization header and CrossTenantInformation.ReadBasic.All permission on App Registration. 

 

Use case

Graph API

GET https://graph.microsoft.com/beta/tenantRelationships/findTenantInformationByDomainName(domainName='<domain>')

{
    "@odata.context": "https://graph.microsoft.com/beta/$metadata#microsoft.graph.tenantInformation",
    "tenantId": "<tenantid>",
    "federationBrandName": null,
    "displayName": "<tenantdisplayname>",
    "defaultDomainName": "<tenantonmicrosoftdomainname>"
}