I used to use a function just fine but recently, perhaps because I corrected my implementation of Google Tag Manger and perhaps for other reason, I can’t seem to use this code which is hooked to a click of a button that completes lessons within WP Courseware. This button is in a page where the GTM code is working fine.

Here is the DataLayer version:

add_action('wpcw_user_completed_unit', 'siv_unit_completed_ga', 50, 3); 
    function siv_unit_completed_ga($userID, $unitID, $unitParentData){  

            $current_user = get_userdata($userID);
            $user_email = $current_user->user_email; 

            $course_post = get_post($unitID);
            // Post Friendly URL (Slug)
            $course_post_slug = $course_post->post_name;
            //$course_post_title = $course_post->post_title;

            $module_id_after_order = $unitParentData->module_order;
            $course_id = $unitParentData->course_id;

            ?>

            <!-- Start Adding of DataLayer Data to GTM -->
            <script>
            window.dataLayer = window.dataLayer || [];
            window.dataLayer.push({
                'event': "Lesson Completed",
                'wp_user_email': "<?php echo $user_email ?>",
                'wp_user_id': "<?php echo $userID ?>",
                'course_id': "<?php echo $course_id ?>",
                'module': "<?php echo $module_id_after_order ?>",
                'unit_id': "<?php echo $unitID ?>",
                'unit_slug': "<?php echo $course_post_slug ?>"
                });
            </script>
            <!-- End Adding of DataLayer Data to GTM -->

    <?php
    }

Similarly, here is the previous code that used to work (Gtag):

add_action('wpcw_user_completed_unit', 'siv_analytics_course_unit_completed_ga', 50, 3);    
    function siv_analytics_course_unit_completed_ga($userID, $unitID, $unitParentData){ 

            $course_post = get_post($unitID);
            // Post Friendly URL (Slug)
            $course_post_slug = $course_post->post_name;
            //$course_post_title = $course_post->post_title;

            $module_id_after_order = $unitParentData->module_order;
            $course_id = $unitParentData->course_id;

            ?>

            <!-- Google Analytics Goal: Completed Lesson -->
            <script type="text/javascript">
                gtag('event', 'Completed', {
                 'event_category': 'Lesson',
                 'event_label': 'C<?php echo $course_id ?>-M<?php echo $module_id_after_order ?>-U<?php echo $unitID ?>:<?php echo $course_post_slug; ?>',                   
                 });
            </script>
    <?php
    }

Would appreciate any feedback/recommendations to help solve this.

Thanks!