OAuth Tutorial Confusion

I'm setting up Google OAuth but having issues with Supabase. Basically, Step 6 (on https://supabase.com/docs/guides/auth/social-login/auth-google?queryGroups=platform&platform=web&queryGroups=environment&environment=client#application-code) is saying to place your Redirect URL as the web site your sign in button appears (?) which in my case because I'm developing locally is http://localhost:3000 however I'm getting Error 400: redirect_uri_mismatch , I'm assuming there's something I'm missing here?
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