A Google SSO failure that results in a 403 error usually shows that the application you're trying to access isn't set up correctly for your user account or organization. It might also indicate an issue with how the application is configured in Google Admin. Additionally, this error could be caused by a problem with the user's account or the application's setup.
USM Content
Symptom
403 Error: app_not_enabled_for_user
After configuring SAML with Google as the Identity Provider (IdP), users might encounter the following error message:
Cause
User access to the app hasn't been enabled.
Resolution
To resolve the issue, contact your IT or Smartsheet System Admin and ask them to follow the steps in this Google Help Center article, which offers guidance for fixing all SAML app error messages.