Microsoft Ads OAuth Redirect Fails – Domain Not Recognized

Microsoft Ads OAuth Redirect Fails – Domain Not Recognized

Microsoft Ads OAuth is a secure authentication protocol that allows third-party applications to access Microsoft Ads accounts on behalf of users. However, sometimes the OAuth redirect may fail with an error message stating "Domain not recognized." This error occurs when the redirect URI (Uniform Resource Identifier) provided by the application during the OAuth flow is not recognized by Microsoft Ads. In this answer, we will discuss the possible causes and solutions for this issue.

Causes of Microsoft Ads OAuth Redirect Fails – Domain Not Recognized Error

1. Incorrect Redirect URI: The most common cause of this error is an incorrect or invalid redirect URI provided during the OAuth flow. The redirect URI is the URL that Microsoft Ads will redirect the user to after the authentication process is complete. Make sure that the redirect URI is correct, matches the one registered in the Microsoft Ads account, and is accessible from the internet.
2. Firewall or Proxy: Firewalls or proxies can sometimes block the redirect URI, preventing the successful completion of the OAuth flow. Check with your IT department or network administrator to ensure that the redirect URI is not being blocked.
3. CORS Policy: Cross-Origin Resource Sharing (CORS) is a security feature that restricts web pages from making requests to a different domain than the one that served the web page. If the redirect URI is on a different domain than the one that served the application, then CORS policies may prevent the successful completion of the OAuth flow. Make sure that the CORS policy for the redirect URI allows requests from the application domain.
4. Microsoft Ads Account Settings: Check the Microsoft Ads account settings to ensure that the redirect URI is registered and enabled. Go to the "Authentication" tab in the Microsoft Ads account, and make sure that the redirect URI is listed under "Redirect URIs."

Solutions for Microsoft Ads OAuth Redirect Fails – Domain Not Recognized Error

1. Correct Redirect URI: Ensure that the redirect URI provided during the OAuth flow is correct and matches the one registered in the Microsoft Ads account.
2. Allow Redirect URI: If the redirect URI is being blocked by a firewall or proxy, then allow it. Contact your IT department or network administrator to make the necessary changes.
3. Update CORS Policy: If the CORS policy is preventing the successful completion of the OAuth flow, then update it to allow requests from the application domain.
4. Register Redirect URI: If the redirect URI is not registered or enabled in the Microsoft Ads account, then register it. Go to the "Authentication" tab in the Microsoft Ads account, and add the redirect URI under "Redirect URIs."
5. Use a Trusted Redirect URI: If none of the above solutions work, then try using a trusted redirect URI. A trusted redirect URI is a URI that is registered and verified with Microsoft Ads. This can be done by following the steps outlined in the Microsoft documentation for registering a trusted redirect URI.

Conclusion

The "Microsoft Ads OAuth Redirect Fails – Domain Not Recognized" error can be caused by several factors, including incorrect redirect URIs, firewalls or proxies, CORS policies, and Microsoft Ads account settings. To resolve this issue, check the causes and solutions outlined in this answer, and follow the steps to ensure that the redirect URI is correct, allowed, and registered with Microsoft Ads. If none of the above solutions work, then try using a trusted redirect URI.