📖 What is Microsoft Entra ID App Registrations?
Microsoft Entra ID App Registrations is the process of registering an application with the identity provider to enable authentication and authorization. This allows the application to request specific permissions to access Microsoft Graph and other protected APIs within the tenant.
"Watch for questions regarding API permissions; remember that some permissions require a 'Grant admin consent' action before they can be used."
📚 Certification: Microsoft 365 Administrator (MS-102)
🔑 What are the Key Concepts of Microsoft Entra ID App Registrations?
- ▸ Application (Client) ID and Directory (Tenant) ID provide the unique identifiers necessary for the application to communicate with the Entra ID identity provider.
- ▸ Delegated permissions allow an app to act on behalf of a signed-in user, while Application permissions allow it to run as a background service.
- ▸ Redirect URIs specify where the authentication server sends the security token after a user successfully authenticates, preventing token interception attacks.
- ▸ Client Secrets and Certificates serve as the application's credentials, enabling the app to prove its identity when requesting tokens from the authorization endpoint.
- ▸ Admin Consent is a mandatory step for high-privilege permissions, ensuring that a global administrator approves the app's access to organizational data.
🎯 How does Microsoft Entra ID App Registrations appear on the MS-102 Exam?
You may be asked to determine the correct permission type for a custom script that synchronizes user data in the background without any user interaction. You must identify that 'Application permissions' are required rather than 'Delegated permissions' for this scenario.
A scenario might describe an application that has been granted the necessary API permissions but still receives an access denied error. You will need to identify that 'Grant admin consent' has not been performed by a tenant administrator.
Expect questions about configuring a multi-tenant application registration to allow users from other Microsoft Entra ID tenants to sign into your organization's application, contrasting this with single-tenant restrictions for internal-only tools.
❓ Frequently Asked Questions
What is the practical difference between Delegated and Application permissions?
Delegated permissions require a signed-in user and are limited by that user's own privileges. Application permissions allow the app to access data independently of a user, which is why they always require administrator consent for security reasons.
When should I use a Client Secret versus a Certificate for authentication?
Client Secrets are easier to implement but less secure. Certificates are recommended for production environments as they provide stronger security and are less susceptible to being leaked in source code or configuration files.