Callback URL not approved for this client application. Approved callback URLs can be adjusted in your application settings

I will explain the steps to solve this auth error with twitter

What you should do is specify your callback URL to twitter

What is a callback URL?

The developers use callback URLs as part of this integration to provide instructions on where a user should go after logging in with their credentials.

• Callback URLS replace it with your localhost
• Website URL you can place your github or linkedin account

I hope and this works for you in your authentication process