Access Blocked: Error 403: access_denied

Describe the problem/error/question

  • Creating Gmail oauth2 API. / When trying to sign in I am getting Error 403: access_denied.

    It is telling me that n8n has not been verified by google.

    There is no workflow to share as I’m just setting up my credential.

Information on your n8n setup

  • n8n version: n8nio/n8n;latest

    Running n8n via: Docker. local install.
    Operating system: Windows 11.

Create Google Consent Screen First

Hey, after setting up the Oauth consent screen (from the left side panel in the Google API Console), please check these steps:

  1. Make sure the n8n redirect URL is correctly set:

    Screenshot 2025-09-17 at 4.15.49 PM

  2. Make sure you copy-pasted the client secret and client ID into n8n without spaces or typos

  3. While at it, also make sure you enabled the Drive API:
    Google Cloud console

Hello, where do I fill in the client password and client ID in N8N? I have been tossed about this for a whole day.

Hey, if you are on the cloud hosted n8n, you won’t see the client and secret fields - simply use the Google sign in button. If you are self-hosting, check if you have this variable and remove it - N8N_DEFAULT_LOCALE

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