post__not_in isn't working in custom Events Query

I’m doing two custom queries to show 1 featured event and 4 small events on the homepage of https://careandshare.wpengine.com/

I’m using post__not_in to try and exclude the featured event from the 4 small events (Take a Turkey Day) but it doesn’t seem to be working, even if I remove the variable and use the actual event ID. I’ve also checked and $featuredPost is returning the correct ID. And I’d double checked that the ID *is* the right event ID

<!--Featured Event-->

<?php $post_objects = get_field('featured_event'); if( $post_objects ): foreach( $post_objects as $post): setup_postdata($post); ?>   

   <a class="event featured-event" href="<?php the_permalink();?>">

        <?php echo wp_get_attachment_image( get_field('event_featured_image'), 'events-large' ); ?>

        <div class="content">
            <h3>
                <?php the_title();?><br/>
                <?php echo tribe_get_start_date($post, false, $format = ' F d, Y' ); ?>
                <span><i class="fa fa-play"></i></span>
            </h3>

            <div class="rollover"><?php the_excerpt();?></div>
        </div>
    </a>

    <?php $featuredPost = get_the_ID(); ?>

<?php endforeach; wp_reset_postdata(); endif; ?>

<!--Regular Events-->

<?php $event_query = new WP_Query(array('post__not_in' => array($featuredPost),'posts_per_page'=> 4,'post_type' => 'tribe_events')); if ( $event_query->have_posts() ) { while ( $event_query->have_posts() ) { $event_query->the_post(); ?>
    <a class="event" href="<?php the_permalink();?>">

        <?php echo wp_get_attachment_image( get_field('event_featured_image'), 'events-small' ); ?>

        <div class="content">
            <h3>
                <?php the_title();?><br/>
                <?php echo tribe_get_start_date($post, false, $format = ' F d, Y' ); ?>
                <span><i class="fa fa-play"></i></span>
            </h3>

            <div class="rollover"><?php the_excerpt();?></div>
        </div>
    </a>

<?php } } wp_reset_postdata(); ?>

https://www.ads-software.com/plugins/the-events-calendar/