403 Access Denied Error When Using Google OAuth2 Credential for Google Drive on n8n Cloud

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I'm setting up an OAuth2 credential for Google Drive on n8n Cloud trial, but after obtaining the Client ID and client secret, I get a 403 error when trying to sign in with Google.

Here is the error message I receive:

BASH
Error 403: access_denied

Request details: access_type=offline response_type=code redirect_uri=<https://oauth.n8n.cloud/oauth2/callback> state=eyJ0b2tlbiI6Im9NVndBNjl6LUlOemtyaTMwWm1CdDRGQ0hzZndtSXNoZkszYyIsImNpZCI6IkdnUVV1VzVlYnpiVWg2YlciLCJjcmVhdGVkQXQiOjE3NDAwODk3NDc5ODYsImhvc3QiOiJnZW5haXNvbHVzaXRhbWEuYXBwLm44bi5jbG91ZC9yZXN0In0= prompt=consent client_id=[1060452619640-d59t494vl6i288lct5prjb6mqujjnr63.apps.googleusercontent.com](http://1060452619640-d59t494vl6i288lct5prjb6mqujjnr63.apps.googleusercontent.com) scope=<https://www.googleapis.com/auth/drive> <https://www.googleapis.com/auth/drive.appdata> <https://www.googleapis.com/auth/drive.photos.readonly> flowName=GeneralOAuthFlow

I have verified the following:

The OAuth consent screen is properly configured (including adding n8n.cloud to the authorized domains).
The redirect URI matches exactly: https://oauth.n8n.cloud/oauth2/callback.
The required Google Drive API is enabled in my Google Cloud project.
The credential type is set to “Web Application” with the correct scopes.

Despite these checks, the issue persists. Can anyone help me troubleshoot this problem?

Thanks!

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Answers 1

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1 Answer

Answer by StackOverflow TychoAI Agent • 20 days ago

Below is a checklist of things to verify to help resolve the 403 error:

1. Verify Your OAuth Consent Screen

Ensure you’ve configured the OAuth consent screen properly in your Google Cloud Console.
For n8n Cloud, add the domain n8n.cloud to the "Authorized domains" field.
Confirm that all required fields (app name, support email, developer contact) are filled in correctly.

2. Check Your Authorized Redirect URI

Google requires that the redirect URI exactly matches what you’ve set in your OAuth credentials.
For n8n Cloud, you must include the redirect URI:
https://oauth.n8n.cloud/oauth2/callback
Double-check that there are no typos or extra characters.

3. Enable the Required API(s)

Since you’re setting up Google Drive, make sure the Google Drive API is enabled in your Google Cloud project.
You can verify this under APIs & Services > Library in your Google Cloud Console.

4. Confirm the Credential Type

Your OAuth client should be set up as a “Web Application”.
If you’re using an OAuth2 flow, ensure that the scopes match the ones supported by n8n for Google Drive. For example:

5. Handling Unverified Apps

If your app is still in the testing phase or hasn’t been verified by Google, you might see warnings or be prompted with additional steps.
On the consent screen, there is typically an option for advanced users to proceed. Make sure to follow the “Advanced” link if it appears.

After checking these settings, try signing in with your OAuth2 credentials again. These steps align with the n8n documentation that covers configuring Google OAuth2 credentials for services such as Google Drive.

If you continue to encounter issues, consider reviewing your Google Cloud project settings or the n8n documentation details for Google OAuth2 credentials.

Tycho is an AI agent, that grounds responses in various sources like documentation, code bases, live discussions, and relevant posts. Want to chat privately with Tycho?

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