"This app is blocked" when creating a new diagram in a Google Doc

[ThomasOwens]

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Describe the bug
A clear and concise description of what the bug is.

To Reproduce
Steps to reproduce the behavior:

1. Add the extension to Google Drive / Google Docs. Grant all requested permissions.
2. Create or open a Google Doc
3. In the toolbar, select Extensions > draw.io > New Diagram...
4. A dialog saying "Authorization required" opens. Click "OK".
5. A window saying "This app is blocked" and "This app tried to access sensitive info in your Google Account. To keep your account safe, Google blocked this access." appears.

Expected behavior
I would expect to be able to use the features of the extension and create a new diagram embedded within a Google Doc file.

Screenshots

Step 3:

Step 4:

Step 5:

I tested the problem in incognito/private mode with all browser extensions switched off, write "yes" below:

• yes

Additional context
I am able to create a new drawing from outside a document and then embed that drawing in a document, but that's an awkward workflow.

[draw-io-triage-bot]

👋 Thank you for opening this issue!

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Summary: User is unable to create a new draw.io diagram from within a Google Doc because the Google OAuth authorization flow results in a 'This app is blocked' error, which is typically caused by Google Workspace admin restrictions on third-party app access or Google's OAuth verification policies.

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🔍 Possible Related Issues

This issue might be related to existing issues:

🟡 #2337 - Stuck at 'authorize' (google)
Both issues involve Google authorization/authentication failures when using draw.io with Google services, though the specific error messages differ ('stuck at authorize' vs 'this app is blocked').

Please check if any of these address your issue. If this is a duplicate, we may close this issue and continue the conversation there.

📝 Additional Information Needed

To help us investigate this more effectively, could you please provide:

• Google Account Type: Whether this is a personal Google account, Google Workspace (business/education) account, or if the organization's admin has restrictions on third-party apps.
• Browser and OS: Which browser (and version) and operating system are being used.

We also have some questions:

• Are you using a Google Workspace (organizational/enterprise/education) account? If so, your organization's admin may have restricted third-party app access, which would cause the 'This app is blocked' message. You would need to ask your Google Workspace admin to allow the draw.io add-on.
• Have you tried revoking draw.io's permissions from your Google Account (https://myaccount.google.com/permissions) and then re-authorizing it?
• Is this a newly installed add-on, or did it previously work and recently stopped working?

📋 Bug Report Template

**Environment:**
- draw.io version: [e.g., web app / desktop 24.x.x / Confluence plugin]
- Browser (if web): [e.g., Chrome 120, Firefox 121]
- OS: [e.g., Windows 11, macOS 14, Ubuntu 22.04]

**Steps to Reproduce:**
1. Go to ...
2. Click on ...
3. See error

**Expected Behavior:**
What you expected to happen.

**Actual Behavior:**
What actually happened.

**Screenshots/Files:**
If applicable, add screenshots or attach the .drawio file.

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_{🤖 This is an automated response to help with initial triage. A human maintainer will review this issue. If you've provided all the requested information, no further action is needed - we'll get back to you soon!}

[ThomasOwens]

To address this questions:

• This is a personal Google account.
• The problem is happening on Windows 11 in the Chrome browser. Chrome is fully up-to-date (version 147.0.7727.119 as of now).
• I have tried revoking the permission and reauthorizing it. The same issue happens.
• I've had the add-on for a while, but this is the first time that I can remember trying to create a new drawing from within a Google Doc instead of just creating a new drawing.