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This guide shows you how to register your own app with Outlook (via Microsoft Entra ID) to obtain your OAuth credentials (client id & secret). These are required to let your users grant your app access to their Outlook account.
1

Create a Microsoft account and Azure account

If you don’t already have them, sign up for a Microsoft account and an Azure account.
2

Register an application in Microsoft Entra ID

  1. Sign in to the Microsoft Entra admin center as at least an Application Developer.
  2. If you have access to multiple tenants, use the Settings icon in the top menu to switch to the tenant in which you want to register the application.
  3. From the search bar at the top of the Azure portal, search for App registrations and select it. Then choose New registration. Or from your left navigation tab, navigate to Applications > App registrations then choose New registration.
  4. Enter a meaningful name for your application, for example “Nango Integration”.
  5. Under Supported account types you need to decide who can install your integration:
    • Accounts in any organizational directory - Any user account in a professional Microsoft organization (Business, School, etc.)
    • Accounts in any organizational directory and personal Microsoft accounts - The accounts from the first option, plus personal Microsoft accounts (pick this unless you want to restrict your integration to business accounts)
  6. Leave the Redirect URI section blank for now; we’ll configure it in a later step.
  7. Click Register to complete the app registration.
3

Note your application (client) ID

After registration, you’ll be taken to the application’s Overview page. Record the Application (client) ID, which uniquely identifies your application and is used in your application’s code as part of validating security tokens.
4

Add a redirect URI

  1. In the left sidebar, select Authentication.
  2. Under Platform configurations, select Add a platform.
  3. Select Web as the platform type.
  4. Enter https://api.nango.dev/oauth/callback as the Redirect URI.
  5. Under Advanced settings, keep Allow public client flows set to the default No for web applications.
  6. Click Configure to save your changes.
5

Add API permissions

  1. In the left sidebar, select API permissions.
  2. Click Add a permission.
  3. Select Microsoft Graph to integrate with Outlook.
  4. Select the required permissions from the Delegated permissions section.
  5. Select the specific permissions your app requires. Common permissions for Outlook include Mail.Read, Mail.ReadWrite, Mail.Send, Calendars.Read, Calendars.ReadWrite, and Contacts.Read. For a complete list, see Microsoft Graph permissions reference.
  6. Click Add permissions.
  7. If your application requires admin consent, click Grant admin consent for [tenant] to pre-authorize the permissions.
6

Create a client secret

  1. In the left sidebar, select Certificates & secrets.
  2. Under Client secrets, click New client secret.
  3. Enter a description for the secret and select an expiration period (6 months, 12 months, 24 months, or custom). Please select a date further in the future to avoid interruptions. Note that the Custom date can only be set to a maximum of 1 year from the current date. If the secret expires, you will need to regenerate a new one and update your integration within Nango.
  4. Click Add.
  5. Important: Copy the secret value immediately and store it securely. You won’t be able to see it again after you leave this page.
7

Configure token settings (optional)

  1. In the left sidebar, select Token configuration. Here you can configure optional claims to be included in the access tokens issued for your application.
  2. Click Add optional claim and select the claims you want to include in your access tokens.
8

Configure app visibility (optional)

If you want users to see your app on their My Apps page:
  1. From the search bar at the top of the Azure portal, search for Enterprise applications, select it, and then choose your app.
  2. On the Properties page, set Visible to users? to Yes.
You can find permissions required for each API call in their corresponding API methods section. For example, to list messages from Outlook, see List Messages permissions.
If your application requires admin consent for certain permissions or if you want to publish your app to the Microsoft commercial marketplace, an app review may be required.
For more details on Microsoft’s OAuth implementation, see Microsoft Graph API documentation.