wp_login action hook not working

I have developed a plugin which works fine, except I need to have some code to execute when the user just logs in, and it does not work.

Here is the code in my plugin:

add_action('wp_login', 'kpcms_update_XAPI_Actor_on_login');
function kpcms_update_XAPI_Actor_on_login() {
ChromePhp::log('login');
session_start();
kpcms_setXAPIActor();
}

ChromePhp::log(‘login’:wink:; is for a Chrome extension which allows to print directly to the browser console.

Nothing is printed, and the function kpcms_setXAPIActor(); is not executed.

Can’t see what is wrong here.

Thanks in advance for feedback.