How to get Azure tenant name from graph.microsoft.com?

Question

I need to discover user's tenant name, since the service endpoint, resourceId that I'll be using an Azure service that requires me to specify the tenant name:

service endpoint: https://[tenantnamme].api.crm.dynamics.com/...
resource Id: https://[tenantname].crm.dynamics.com

I was hoping Unified Microsoft Graph API can discover this for me. I looked at the documentation, the closest I can see is to use graph.microsoft.com/v1.0/organization which will give me back: verifiedDomains : [ .... "name" : "contoso.onmicrosoft.com" ]

But, I'm not sure if this is the right approach. What if an org has multiple verified domains? Does verified domain name is the same as tenant name?

Update: This is my real scenario. I have a web app that allows user to authenticate to Azure AD via OAuth2. I have no problem obtaining refresh token and access token from OAuth interactions. However, in other to use other service, it requires [azure-ad-tenant-name] in their service end point. That's my question coming from.

Answer 1

I believe that you're on the right track with the graph.microsoft.com/v1.0/organization endpoint. You should be able to find the tenant name in the verifiedDomains list. The entry that should contain domain with the tenant name is the initial domain:

{
    ...
    "isInitial": true,
    "name": "contoso.onmicrosoft.com",
    ...
}