Fix OAuth Errors on Auth0

Last updated: April 2026

The most common Auth0 OAuth errors and recommended configurations to address them.

redirect_uri_mismatch

Auth0 Dashboard → Applications → Your App → Settings → Allowed Callback URLs. Add the exact URI your app sends, including protocol and port.

# Add all environments:
https://yourapp.com/callback, http://localhost:3000/callback

PKCE not working

# Auth0 Dashboard -> Applications -> Your App -> Settings
# Grant Types -> enable "Authorization Code (PKCE)"
# SDK config (auth0-react):
const { Auth0Provider } = require('@auth0/auth0-react');
<Auth0Provider
  domain="YOUR_DOMAIN"
  clientId="YOUR_CLIENT_ID"
  authorizationParams={{ redirect_uri: window.location.origin }}
>

invalid_grant on token refresh

Auth0 refresh tokens expire based on your tenant settings. Check: Dashboard → Applications → APIs → Token Settings → Refresh Token Expiration.

# Catch invalid_grant and re-authenticate
auth0.getTokenSilently().catch(err => {
  if (err.error === 'invalid_grant') auth0.loginWithRedirect();
});

Login required error (silent auth)

# Auth0 Dashboard -> Applications -> Your App -> Advanced Settings
# Grant Types -> enable "Implicit" (if using silent auth)
# Or configure Refresh Token Rotation instead of silent auth