Your users are receiving the following error while trying to authenticate into your application with their Google account, you as the developer verify your Gmail application:
This app is blocked. This app tried to access sensitive info in your Google Account. To keep your account safe, Google blocked this access.
Cause:
If your Google Cloud project is unverified, there is a 100 user OAuth rate limit quota. After 100 Google accounts have been authenticated into your project, more users will be unable to authenticate.
If your users are using G Suite accounts, and the G Suite administrator has whitelisted your application those users will not count towards the 100 user limit.
Resolutions:
- Undergo the Google Verification process for your application.
- This must be completed on your primary domain, the subdomain can change at a later date.
- Request the accounts mail administrator to whitelist your application.
Warning: If your google APP goes over 100 user over the lifetime of the app they will see the app is blocked warning, there is no reducing this number.
Resources:
How can I whitelist my application in Gmail?
Google Workspace Enterprise admin options
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