How do I replace person e mail from frontend enter discipline?

I am utilizing the beneath operate which is working for my cellphone and tackle fields. I can not seem to change the e-mail although… any concept what I am doing improper?

operate um_modifications_callback() {

    // Guarantee we've the information we have to proceed
    if( ! isset( $_POST ) || empty( $_POST ) || ! is_user_logged_in() ) {

        // If we do not - return customized error message and exit
        header( 'HTTP/1.1 400 Empty POST Values' );
        echo 'Might Not Confirm POST Values.';
        exit;
    }

    $user_id        = get_current_user_id();                            // Get our present person ID
    $um_val         = sanitize_text_field( $_POST['first_name'] );      // Sanitize our person meta worth
    $um_user_email  = sanitize_text_field( $_POST['user_email'] );      // Sanitize our person e mail discipline

    $cellphone = $_POST['phone'];
    $tackle = $_POST['address'];
    $e mail = $_POST['user_email'];
    
    update_field('cellphone', $cellphone, 'user_'.$user_id);
    update_field('tackle', $tackle, 'user_'.$user_id);

    update_user_meta( $user_id, 'first_name', $um_val );                // Replace our person meta

    wp_update_user( array(
        'ID'            => $user_id,
        'user_email'    => $e mail,
    ) );

    exit;
}