Understanding the ‘access blocked: n8n.cloud has not completed the Google verification process’ Error
The error appears when Google Blocks OAuth authentication requests from n8n.cloud because its verification process with Google is not finalized. This means n8n.cloud cannot request sensitive scopes using Google APIs, leading to denied access during account linking.
Immediate Fix Summary
To bypass the error securely, users should create their own verified Google Cloud OAuth credentials and configure them within the n8n instance. This enables authenticated connections without relying on n8n cloud verification. During our testing, this approach resolved the issue within minutes.
Technical Cause
The root cause is that n8n.cloud uses shared credentials unverified by Google at the time of authentication. According to 2026 documentation on OAuth compliance, unverified apps cannot access sensitive scopes, hence the ‘access blocked’ message.
Step-by-Step Solution
The following configuration steps directly fix the authentication block and restore workflow integration with Google services.
- Log into your Google Cloud Console.
- Create a new project dedicated for n8n automation.
- Enable the required APIs, e.g., Gmail API, Google Sheets API.
- Navigate to ‘Credentials’ > ‘Create Credentials’ > ‘OAuth client ID’.
- Set the type to ‘Web application’.
- Add the n8n.cloud domain and redirect URI displayed in your n8n settings.
- Copy the generated Client ID and Client Secret.
- Open your n8n settings under ‘Credentials’.
- Insert your new Client ID and Client Secret.
- Save and test your connection—authentication will proceed without the error.
Alternative Workarounds
Users impacted by this verification block may choose self-hosting options or use local OAuth credentials. A self-hosted instance does not rely on n8n.cloud global OAuth apps, thus avoids verification dependencies entirely.
Comparison of Verification Paths
This table summarizes differences between relying on n8n.cloud verification and creating your own OAuth configuration.
| Method | Control Level | Verification Dependency | Security Level |
|---|---|---|---|
| n8n.cloud Default | Low | Requires Google Verification | Moderate |
| Custom OAuth via Google Cloud | High | Immediate Approval | High |
| Self-Hosted n8n | Full | Independent | High |
Associated Automation Tools
Automation ecosystems like HubSpot or
