The errors you will actually hit

OAuth with Google · lesson 5 of 9 · 4 min read

Four Google-specific failures and what each one really means.

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Key points

  • redirect_uri_mismatch: the URI differs from the registered one - usually http vs https, a port, or a trailing slash.
  • access_blocked: the consent screen is still in Testing and this account is not a listed test user.
  • No refresh_token: you omitted access_type=offline, or the user had already consented before.
  • invalid_client: the client secret is wrong, or you are using a client id from a different project.
  • Sensitive scopes need Google verification - a full review that takes weeks, so plan it before launch.

Almost every Google OAuth failure is the redirect URI, Testing mode, or a missing prompt=consent.

Never key your users on email Wiring Sign in with Google into Spring Boot

This is a reading copy. The full lesson — with the visual explainer, the interactive lab and a Run button for the code — lives in the OAuth with Google course, and every lesson in it is listed on the OAuth with Google contents page.