OAuth Client Verification

Starting July 18, 2017, Google OAuth clients that request certain sensitive OAuth scopes will be subject to review by Google.

Users from outside the developer’s domain accessing the OAuth prompt for a client that has not been reviewed and verified will see a new unverified app screen, and the number of such users will be capped. An unverified authorization flow allows users to authorize unverified apps, but only after confirming they understand the risks. You can read more about this change in this help center article.

Unverified app screen
Figure 1: Unverified app screen
Unverified app authorization flow
Figure 2: Unverified app authorization flow


This change applies to Google OAuth web clients, including those used by all Apps Script projects. By verifying your app with Google, you can remove the unverified app screen from your authorization flow and give your users confidence that your app is non-malicious.

Unverified apps

Add-ons, web apps, and other deployments (such as apps that use the Apps Script API) may need verification.


If the app uses sensitive OAuth scopes, the unverified app screen may appear as part of the authorization flow. Its presence (and the resulting unverified app authorization flow) depends on what account the app is published from and what account is attempting to use the app. For example, apps published in a specific domain of a customer do not result in the unverified app authorization flow for accounts in that domain, even if the app has not been verified.

The following table illustrates what situations result in the unverified app authorization flow:

Client is verified Publisher is a G Suite account of customer A Script is in a Team Drive of customer A Publisher is a Gmail account
User is a G Suite account of customer A Normal auth flow Normal auth flow Normal auth flow Unverified auth flow
User is a G Suite account not of customer A Normal auth flow Unverified auth flow Unverified auth flow Unverified auth flow
User is a Gmail account1 Normal auth flow Unverified auth flow Unverified auth flow Unverified auth flow

1Any Gmail account, including the account used to publish the app.

User cap

The number of users who can authorize an app via the unverified app flow is capped to limit possible abuse. See OAuth application user limits for details.

This cap does not apply to verified apps.

Requesting verification

You can request a review of the OAuth client used by your app and its Cloud project. Once your app is verified at the end of this review, your users will no longer see the unverified app screen. In addition, your app will no longer be subject to the user cap.


In order to submit your OAuth client for review and verification, you must:

  1. Own a domain and have verified ownership with Google, and
  2. Have a page describing your app's privacy policy hosted within the domain.


  1. In the Apps Script editor, select File > Project properties > Scopes. Make a note of all the scopes your script project uses.
  2. Ensure that you have access to the Cloud Platform project for your Apps Script Project. If your project resides in a Team Drive, you must associate it with a new Cloud Platform project.
  3. Access the API Console by selecting Resources > Cloud platform project… In the dialog that opens, click the top link, which is typically something like [Script Name] - project-id-123456789012. This opens your script's Cloud Platform project.
  4. If you can't find the left nav bar, click the menu icon in the top left.
  5. In the nav bar, select APIs & services > Credentials.
  6. On the OAuth consent screen tab, fill in your Privacy policy URL. This URL must be hosted in a domain you own.
  7. On the Credentials tab, make a note of the Client ID for the Apps Script OAuth client.
  8. In the upper-right corner of the API Console, select ⋮ > Project settings.
  9. Make a note of the Project ID for your Cloud project.
  10. File a review request of your project’s OAuth client. You'll need the client and project IDs you noted, as well as your privacy policy URL and the list of scopes your app requires.

Most verification requests receive a response within 24 to 72 hours. When verification of your OAuth client is confirmed, your app is verified.

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