Redirect URI mismatch

Redirect URI mismatches occur when the OAuth callback URL in your authentication provider (like Google Cloud Console or Supabase) doesn't match what's configured in your app. Ensure the redirect URL includes the full path (e.g., http://localhost:3000/auth/callback for local dev) and matches exactly in Supabase Authentication → URL Configuration. For deployed apps, add both your local dev URL and production URL to the redirect URLs list.