How can I fix my TikTok API OAuth2 credential connection error?

Below is a list of troubleshooting steps based on common OAuth2 issues you might encounter when creating a generic credential for a new API like TikTok. While n8n’s documentation covers generic OAuth2 setups for services like Spotify and Google, many of the same principles apply:

1. Verify Redirect URL Configuration

• Make sure the OAuth Redirect URL that n8n provides is exactly replicated in your TikTok Developer Portal settings.
• Double-check for any extra slashes, typos, or differences in protocol (http vs. https).

2. Check OAuth2 Endpoints and Scopes

• Confirm that you have the correct authorization and token URLs from the TikTok API documentation.
• Ensure that the OAuth2 scopes you configured in n8n match those expected by TikTok. Inconsistent or missing scopes can sometimes cause the process to fail.
• TikTok may require specific parameters (or additional custom parameters) in the authorization or token request. Compare these with n8n’s generic OAuth2 structure.

3. Review Your TikTok App Settings

• Since your app is live in production and approved, verify that no additional settings are required on TikTok’s side (for instance, a mandatory state parameter or PKCE flows).
• Check if TikTok expects any additional response parameters that might not be handled automatically.

4. Monitor Network Requests and Logs

• Enable execution logging in n8n to capture any error output or additional information when you press “Connect my account.”
• Open your browser’s developer console during the connection process to inspect any network errors or error messages that appear when the flow stops.

5. Test with Another OAuth2 Service

• If possible, test a generic OAuth2 setup with another service (such as Spotify or Google) to ensure your n8n instance is correctly handling OAuth2 flows. This helps verify that the issue is specific to the TikTok integration.

If after verifying all of these points the credential still isn’t connecting, it may be useful to capture and compare the exact authorization redirected URL and token request details with the TikTok documentation. This step-by-step comparison can help you pinpoint any mismatch.

Remember that the generic OAuth2 credential in n8n is flexible, but it also requires exact matches between your API’s settings and what n8n expects. Double-check the TikTok docs for any nuances in their implementation.

Good luck—and have a nice day!