无法通过Refresh Token获取Access Token，请求Graph API解决建议

Hey there! Sorry to hear you're hitting issues refreshing your access token via the Graph API. Let's walk through the most common culprits and fixes to get you back on track:

• Verify your refresh token is still valid

  • Refresh tokens for Graph API can expire if they're unused for 90+ days, if the user changes their password, or if the user revokes your app's permissions. A common error here is invalid_grant—if you see that, your refresh token is likely invalid and you'll need to have the user re-authenticate to get a new one.

• Double-check your request parameters

  • Make sure your POST request includes all required parameters, with no typos or missing values:
    • grant_type must be set exactly to refresh_token
    • client_id matches the ID of your registered Azure AD app
    • client_secret (for confidential clients like web apps) is correct—watch out for extra spaces or copied characters
    • refresh_token is the full, unmodified token you received earlier
    • For tenant-specific apps, include the correct tenant_id
  • Here's a valid example request for a confidential client:

    POST /{tenant-id}/oauth2/v2.0/token HTTP/1.1
    Host: login.microsoftonline.com
    Content-Type: application/x-www-form-urlencoded
    
    client_id=your-client-id&client_secret=your-client-secret&grant_type=refresh_token&refresh_token=your-refresh-token&scope=openid%20email%20profile
    

• Ensure your scopes match the original authorization

  • You can't request new scopes when refreshing an access token—your scope parameter must be a subset of the scopes you used when you first got the refresh token. If you try to add new permissions here, you'll get an error.

• Check your client type

  • If you're using a public client (like a desktop or mobile app), don't include the client_secret in your request. Public clients don't use this parameter, and adding it will cause an invalid_client error.

• Validate your Azure AD app configuration

  • Make sure your app has the correct platform enabled in Azure AD's "Authentication" settings (e.g., Web, Desktop) and that redirect URIs are properly configured (even though refresh requests don't use redirects, this affects token issuance rules).
  • For multi-tenant apps, confirm you're using common as the tenant_id (if you want any Azure AD user to authenticate) or the specific tenant ID you need.

• Dig into the exact error details

  • The error response from Graph API will give you specific codes and messages that pinpoint the issue. For example:
    • invalid_client: Wrong client ID or secret
    • unauthorized_client: Your app isn't allowed to use the refresh token flow
    • invalid_scope: The scopes you're requesting are invalid or not allowed
  • If you can share the full (desensitized) error message, it'll be easier to narrow down the problem!

内容的提问来源于stack exchange，提问作者ashish jayara