[Theme Horse Support Team]

Hi FlaviaNY,
Just add this below code to create child theme

/*
Theme Name: Ambition Child Theme
Theme URI: https://www.themehorse.com/themes/ambition
Author: Theme Horse
Author URI: https://www.themehorse.com
Text Domain: ambition
Template: ambition
*/

@import url("../ambition/style.css"); 

The above code which you have provided, i am not sure why its not working. But i tested in my local environment and its working fine.

Thank you!