Can’t Connect Google Drive OAuth2 on n8n.cloud – “Access blocked” Error

Questions
1

Hi, I’m using n8n.cloud and trying to connect to Google Drive using the built-in OAuth2 credentials, but I’m getting this error from Google:

Access blocked: n8n.cloud has not completed the Google verification process. The app is being tested and can only be used by developer-approved testers.

Here’s what I’ve tried:

  • Created my own Google Cloud project
  • Set up an OAuth2 client
  • Tried to add my Gmail as a test user, but Google won’t let me add users since I’m not the app developer
  • Used this redirect URI: https://oauth.n8n.cloud/oauth2/callback

Still getting a 403 error.

I also can’t use Service Account credentials because n8n.cloud doesn’t support community nodes.

Problem Summary:

  • Can’t authorize Google Drive via OAuth2
  • Can’t add test users to bypass the restriction
  • Can’t use Service Accounts
  • Completely blocked from using Google Drive integration
2

:white_check_mark: How to Add Test Users for Google OAuth (n8n.cloud)

If you’re using Google OAuth with n8n.cloud and seeing this error:

:cross_mark: Access blocked: n8n.cloud has not completed the Google verification process.

Then you need to add your Gmail account as a test user to your Google Cloud OAuth app.

:puzzle_piece: Prerequisites

:hammer_and_wrench: Steps to Add Yourself as a Test User

  1. Go to Google Cloud Console.
  2. Select your project (top bar).
  3. Navigate to:
    APIs & Services → OAuth consent screen
  4. Ensure the User Type is set to External.
  5. Scroll down to Test Users section.
  6. Click “Add Users”.
  7. Enter your Gmail address (the one you’re using with n8n).
  8. Click Save and Continue.

:repeat_button: Reconnect in n8n.cloud

Once added:

  • Go back to n8n.cloud
  • Create or edit the Google Drive credential
  • Complete the OAuth login flow — it should now work :white_check_mark:

:white_check_mark: Notes

  • Test mode allows up to 100 email addresses to be added without app verification.
  • If you’re using https://oauth.n8n.cloud/oauth2/callback, make sure it’s added under:
    • OAuth 2.0 Client IDs → Edit → Authorized redirect URIs

:soap: Common Errors

Error Reason Solution
Access Blocked You’re not on the test users list Add your Gmail to “Test Users”
redirect_uri_mismatch Wrong URI Must be https://oauth.n8n.cloud/oauth2/callback

Done! :tada: You can now use Google Drive (or other Google APIs) in n8n.cloud with OAuth 2.0.

3

This is ai generated response now @bartv