Why You Might Need to Know Your Microsoft 365 Tenant Identifier
Every Microsoft 365 tenant is identified by a GUID, a globally unique identifier, which looks something like abf988bf-86f1-41af-91ab-2d7cd011db46. Applications use the tenant identifier to know which organization data belongs to. Occasionally, administrators need to know the identifier too:
Microsoft support might ask for the tenant identifier as part of the information gathered for a support incident.
If you participate in a test of new functionality, the Microsoft engineering group responsible for the feature will need the tenant identifier to enable (or “flight”) the software.
Apps registered in Azure AD which use the Graph APIs to access tenant data must pass the tenant identifier along with the app identifier and app secret when requesting an access token. The combination of the three pieces of data allows Azure AD to grant the necessary token.
Applications like Teams include the tenant identifier in the links used to identify data. For instance, the deeplink used for a Teams meeting contains the tenant identifier.
Available to Allow Apps to Authenticate
Tenant identifiers are exposed publicly. If they were not, applications based on the Graph APIs or any others using OAuth 2.0 could not connect to a tenant. These apps use OpenID Connect, described by MVP Curtis Johnstone as “a simple identity layer that sits on top of OAuth 2.0. For Office 365 there is an OpenID Connect metadata document for each tenant which contains more of the information required for apps to perform sign-ins (including the tenant id).”
Get-MgOrganization | Select Id, DisplayName
Id DisplayName
-- -----------
a462313f-14fc-43a2-9a7a-d2e27f4f3478 Office 365 for IT Pros
Much the same happens when connecting to Microsoft Teams with PowerShell. Again, the connection responds with tenant information with the tenant identifier shown for both the tenant name and identifier!
If you have a PowerShell session connected to Azure AD, you can run the Get-AzureADTenantDetail cmdlet. This is the method I typically use.
Get-AzureADTenantDetail
ObjectId DisplayName VerifiedDomain
-------- ----------- --------------
A462313f-14fc-43a2-9a7a-d2e27f4f3478 Office 365 for IT Pros Office365ITPros.com
The Overview page of the Azure AD portal includes the tenant identifier and has the useful ability to copy the identifier to the clipboard (Figure 2).
Figure 2: The tenant identifier is included in the tenant information in the Azure AD portal
Azure Where’s My Tenant
Azure operates a service to lookup using a tenant (Figure 3) to find details of a domain belonging to an Azure AD tenant (Figure 3). You can also input the Microsoft 365 tenant identifier.
Figure 3: Looking up Microsoft.com with the Azure service
ShareGate’s Service
ShareGate is an ISV specializing in SharePoint Online solutions. It offers a similar service to the Azure lookup at WhatIsMyTenantId.com. Figure 4 shows the result after checking for Quest.com. Remember, the tenant information is public!
Figure 4: Finding the tenant identifier for a domain
I don’t ever use WhatIsMyTenantId.com, but I’m sure others do, especially when you have a bunch of tenants to manage.
The detail makes the difference. Learn about the detail of managing your tenant by subscribing to the Office 365 for IT Pros eBook. Updated monthly to include those changing details which make all the difference…
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Hello,
If I have a list with over 1500 domains, I need to check if they are using Azure AD, any idea how can I do that?
You might be able to use a web request to check each domain against ShareGate’s service. I haven’t tried to do this, though.
You can do this here via this script. Also note the new service from MS which also priovides the geo location of the tenant. https://gettenantpartitionweb.azurewebsites.net/
https://github.com/JBines/Get-ParkedDomainsInfo.ps1
Thanks!