Your Google account connects perfectly. Other accounts don't.
You built an application that connects to Google Drive, Gmail, or Calendar. You tested it with your own Google account, and everything worked. Then customers tried connecting their accounts. Some receive an access error, others see a warning about an unverified application, and some connect successfully only to discover that the integration stops working later.
Consider a hypothetical document-management application. The founder connects their Google Drive and imports documents without problems. But when customers attempt the same thing, they encounter an authorization error. The founder assumes the integration code is broken. In reality, the cause could be the application's Google OAuth configuration, the permissions being requested, or restrictions imposed by a customer's Google Workspace administrator.
Signing in with Google is not permission to access Google Drive
Google distinguishes authentication, confirming who a user is, from authorization, granting an application permission to access specific information or perform actions. A customer successfully signing in with Google does not automatically authorize your app to read Drive files or send Gmail messages. Those capabilities require appropriate OAuth scopes, meaning explicitly requested permissions.
Google's OAuth configuration also controls which audiences can authorize an application, whether test users are restricted, and whether sensitive or restricted permissions require verification. Errors such as redirect_uri_mismatch, access_denied, and invalid_grant can have different causes. An access token permits API access for a limited period, while a refresh token may allow the app to obtain another access token. Google's OAuth overview documents several reasons refresh tokens stop working, including revocation and administrator policies. Its seven-day refresh-token rule applies to external apps in Testing status, with an exception when only basic identity scopes are requested; it does not apply indiscriminately to every Google integration.
When is professional help worthwhile?
If your application relies on customers connecting their own Google accounts, OAuth is part of your product's core functionality. A reliable integration must handle different users, account policies, consent choices, and token lifecycles, not just your personal test account.
DitchNow helps founders build, repair, and maintain third-party integrations that work beyond the original development environment.
Discuss your Google integration with DitchNow.
Five prompts to investigate Google authorization
Before you begin: Use these prompts one at a time in the same project conversation. Give the assistant access only to approved project materials, use synthetic test data, and review its findings before approving changes.
1. Map
Inspect my application and map its Google authentication and OAuth authorization flows. Identify whether it uses Google Sign-In, Google APIs, or both. Document the OAuth client configuration visible in approved materials, consent screen audience, publishing status, requested scopes, redirect URIs, token storage and refresh mechanisms, and relevant API calls. Provide code references and distinguish verified settings from configurations requiring Google Cloud Console access. Do not modify anything.
2. Audit
Perform a read-only OAuth audit for this symptom: [DESCRIBE ERROR]. Examine sanitized error records for redirect_uri_mismatch, access_denied, invalid_grant, expired or revoked tokens, and API permission failures. Assess test-user restrictions, OAuth scopes, consent screen status, verification requirements, refresh-token handling, and possible Google Workspace administrator policies. Explain which causes match the evidence and which require customer-side confirmation.
3. Plan
Propose a remediation plan for the confirmed Google OAuth problems. Include correct redirect URI registration, appropriate consent screen configuration, minimum required scopes, secure token handling, refresh-token lifecycle management, reauthorization behavior, and clear customer-facing error messages. Identify any Google verification or Workspace administrator approval requirements that cannot be solved through code. Include acceptance criteria for both new and returning users.
4. Challenge
Perform a second-pass self-review of your proposed solution. Challenge the assumptions about publishing status, testing-mode token expiry, granted scopes, and customer account restrictions. Design isolated tests using authorized test identities for successful consent, denied consent, revoked access, token expiry, and restricted Workspace accounts where available. Identify remaining unknowns and actions requiring administrator approval.
5. Implement
I approve the following scope: [APPROVED SCOPE]. Implement the authorized application changes in an isolated test environment using securely configured OAuth credentials and approved test accounts. Verify consent, granted scopes, API access, token refresh, and error handling. Report changed files, test results, external configuration tasks, and limitations. Do not publish the OAuth app, request production verification, alter live customer tokens, or deploy automatically.