tml_new_user_activated hook is not working

Hello All,

I want to change the user role after user activation. I am using user moderation through admin approval. So,I am using this code :

function set_role_on_activation( $user_id ) {
echo "<script>alert('hello');</script>";
}

add_action( 'tml_new_user_activated', 'set_role_on_activation' );

I have written this code in my functions.php. But when I am approving user through admin login from back end alert is not coming.

Please help, why it is not working.

Thanks in advance
Sunil

https://ww.wp.xz.cn/plugins/theme-my-login/