You can create up to 20 tenants per subscription. This limit help protect against threats to your resources, such as denial-of-service attacks, and is enforced in both the Azure portal and the underlying tenant creation API. If you want to increase this limit, please contact Microsoft Support .

By default, each tenant can accommodate a total of 1 million objects (user accounts and applications), but you can increase this limit to 5 million objects when you add and verify a custom domain. If you want to increase this limit, please contact Microsoft Support . However, if you created your tenant before September 2022 , this limit doesn't affect you, and your tenant will retain the size allocated to it at creation, that's, 50 million objects. Learn how to read your tenant usage .

If you want to reuse a tenant name that you previously tried to delete, but you see the error "Already in use by another directory" when you enter the domain name, you'll need to follow these steps to fully delete the tenant before you try again. You require a role of at least Subscription Administrator . After deleting the tenant, you might also need to sign out and sign back in before you can reuse the domain name.

Prerequisites

An Azure subscription. If you don't have one, create a free account before you begin.

An Azure account that's been assigned at least the Contributor role within the subscription or a resource group within the subscription is required.

You can’t create subscriptions in or transfer subscriptions to Azure AD B2C tenant. You create a subscription in Azure AD tenant, and then link it to your Azure AD B2C tenant .

Create an Azure AD B2C tenant

If you're unable to create Azure AD B2C tenant, review your user settings page to ensure that tenant creation isn't switched off. If tenant creation is switched on, ask your Global Administrator to assign you a Tenant Creator role.

Sign in to the Azure portal .

Make sure you're using the Microsoft Entra tenant that contains your subscription:

In the Azure portal toolbar, select the Directories + subscriptions ( ) icon.

On the Portal settings | Directories + subscriptions page, find your Microsoft Entra directory that contains your subscription in the Directory name list, and then select Switch button next to it.

Add Microsoft.AzureActiveDirectory as a resource provider for the Azure subscription you're using ( learn more ):

On the Azure portal menu or from the Home page, select Create a resource .

Search for Azure Active Directory B2C , and then select Create .

Select Create a new Azure AD B2C Tenant .

On the Create a directory page:

Select Review + create .

Review your directory settings. Then select Create . Learn more about troubleshooting deployment errors .

You can link multiple Azure AD B2C tenants to a single Azure subscription for billing purposes. To link a tenant, you must be an admin in the Azure AD B2C tenant and be assigned at least a Contributor role within the Azure subscription. See Link an Azure AD B2C tenant to a subscription .

When an Azure AD B2C directory is created, an application called b2c-extensions-app is automatically created inside the new directory. Do not modify or delete it. The application is used by Azure AD B2C for storing user data. Learn more about Azure AD B2C: Extensions app .

Activate Azure AD B2C Go-Local add-on

Azure AD B2C allows you to activate Go-Local add-on on an existing tenant as long as your tenant stores data in a country/region that has local data residence option. To opt-in to Go-Local add-on, use the following steps:

Sign in to the Azure portal .

Make sure you're using the directory that contains your Azure AD B2C tenant:

In the Azure portal toolbar, select the Directories + subscriptions ( ) icon.

On the Portal settings | Directories + subscriptions page, find your Azure AD B2C directory in the Directory name list, and then select the Switch button next to it.

In the Azure portal, search for and select Azure AD B2C .

On the tenant management page that appears, on the top of the page, select Enable data residency link.

On the Data residency pane that appears, select the Store my directory and Microsoft Entra data in <Country> checkbox, then select Save button.

Close the Data residency pane.

Select your B2C tenant directory

To start using your new Azure AD B2C tenant, you need to switch to the directory that contains the tenant:

Sign in to the Azure portal .

In the Azure portal menu, select All services .

In the All services search box, search for Azure AD B2C , hover over the search result, and then select the star icon in the tooltip. Azure AD B2C now appears in the Azure portal under Favorites .

If you want to change the position of your new favorite, go to the Azure portal menu, select Azure AD B2C , and then drag it up or down to the desired position.

Next steps

In this article, you learned how to: