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Showing content from https://docs.microsoft.com/azure/active-directory/develop/scenario-protected-web-api-overview below:

Protected web API app registration - Microsoft identity platform

Applies to: Workforce tenants External tenants (learn more)

This article explains how to register an application for a protected web API.

For the common steps to register an app, see Quickstart: Register an application with the Microsoft identity platform.

The Microsoft identity platform can issue v1.0 tokens and v2.0 tokens. For more information about these tokens, refer to Access tokens.

The token version your API may accept depends on your Supported account types selection when you create your web API application registration in the Azure portal.

• If the value of Supported account types is Accounts in any organizational directory and personal Microsoft accounts (such as Skype, Xbox, Outlook.com), the accepted token version must be v2.0.
• Otherwise, the accepted token version can be v1.0.

After you create the application, you can determine or change the accepted token version by following these steps:

1. In the Microsoft Entra admin center, select your app and then select Manifest.
2. Find the property accessTokenAcceptedVersion in the manifest.
3. The value specifies to Microsoft Entra which token version the web API accepts.
   • If the value is 2, the web API accepts v2.0 tokens.
   • If the value is null, the web API accepts v1.0 tokens.
4. If you changed the token version, select Save.

The web API specifies which token version it accepts. When a client requests a token for your web API from the Microsoft identity platform, the client gets a token that indicates which token version the web API accepts.

Web APIs don't need to register a redirect URI because no user is interactively signed in.

Other settings specific to web APIs are the exposed API and the exposed scopes or app roles.

Scopes usually have the form resourceURI/scopeName. For Microsoft Graph, the scopes have shortcuts. For example, User.Read is a shortcut for https://graph.microsoft.com/user.read.

During app registration, define these parameters:

• The resource URI
• One or more scopes
• One or more app roles

By default, the application registration portal recommends that you use the resource URI api://{clientId}. This URI is unique but not human readable. If you change the URI, make sure the new value is unique. The application registration portal will ensure that you use a configured publisher domain.

To client applications, scopes show up as delegated permissions and app roles show up as application permissions for your web API.

Scopes also appear on the consent window that's presented to users of your app. Therefore, provide the corresponding strings that describe the scope:

• As seen by a user.
• As seen by a tenant admin, who can grant admin consent.

App roles cannot be consented to by a user (as they're used by an application that calls the web API on behalf of itself). A tenant administrator will need to consent to client applications of your web API exposing app roles. See Admin consent for details.

To expose delegated permissions, or scopes, follow the steps in Configure an application to expose a web API.

If you're following along with the web API scenario described in this set of articles, use these settings:

• Application ID URI: Accept the proposed application ID URI (api://<clientId>) (if prompted)
• Scope name: access_as_user
• Who can consent: Admins and users
• Admin consent display name: Access TodoListService as a user
• Admin consent description: Accesses the TodoListService web API as a user
• User consent display name: Access TodoListService as a user
• User consent description: Accesses the TodoListService web API as a user
• State: Enabled

Tip

For the Application ID URI, you have the option to set it to the physical authority of the API, for example https://graph.microsoft.com. This can be useful if the URL of the API that needs to be called is known.

Expose application permissions instead of delegated permissions if your API should be accessed by daemons, services, or other non-interactive (by a human) applications. Because daemon- and service-type applications run unattended and authenticate with their own identity, there is no user to "delegate" their permission.

To expose application permissions, follow the steps in Add app roles to your app.

In the Create app role pane under Allowed member types, select Applications. Or, add the role by using the Application manifest editor as described in the article.

App roles are the mechanism an application developer uses to expose their app's permissions. Your web API's code should check for app roles in the access tokens it receives from callers.

To add another layer of security, a Microsoft Entra tenant administrator can configure their tenant so the Microsoft identity platform issues security tokens only to the client apps they've approved for API access.

To increase security by restricting token issuance only to client apps that have been assigned app roles:

1. In the Microsoft Entra admin center, select your app under Entra ID > App registrations.
2. On the application's Overview page, in Essentials, find and select its Managed application in local directory link to navigate to its Enterprise Application Overview page.
3. Under Manage, select Properties.
4. Set Assignment required? to Yes.
5. Select Save.

Microsoft Entra ID will now check for app role assignments of client applications that request access tokens for your web API. If a client app hasn't been assigned any app roles, Microsoft Entra ID returns an error message to the client similar to _invalid_client: AADSTS501051: Application \<application name\> isn't assigned to a role for the \<web API\>_.

Warning

DO NOT use AADSTS error codes or their message strings as literals in your application's code. The "AADSTS" error codes and the error message strings returned by Microsoft Entra ID are not immutable, and may be changed by Microsoft at any time and without your knowledge. If you make branching decisions in your code based on the values of either the AADSTS codes or their message strings, you put your application's functionality and stability at risk.

The next article in this series is App code configuration.

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