Pull content from atom feed with SimplePie into WordPress

I am trying to pull content from a job vacancy feed into a WordPress website. I've never done this before so not quite got it right. I've managed to pull in the Job Title and Published date, but I can't seem to pull anything else and It's going a little over my head.

Any info/help would be much appreciated.

This is the feed I am pulling from:

<rss xmlns:a10="http://www.w3.org/2005/Atom" version="2.0">
<channel>
   <title>RSS Feed Title</title>
   <link>https://feedlink.com
   <description>RSS Feed Description</description>
   <item>
       <link>https://feedlink/item.com</link>
       <title>Item Title One</title>
       <a10:updated>2019-09-19T11:53:35Z</a10:updated>
       <a10:content type="text/xml">
           <vacancy>
               <vacancyid>019623</vacancyid>
               <vtitle>Item Title One</vtitle>
               <vacancypublishinfoid>1744392</vacancypublishinfoid>
               <vlocation>Location</vlocation>
               <vsalary>£10 ph</vsalary>
               <vexpirydate>07/10/2019 23:59:00</vexpirydate>
               <vmlocation>Location</vmlocation>
               <vmdiscipline>Vacancy intro</vmdiscipline>
               <vadvert>Main vacancy details</vadvert>
               <vreference>HCGWH464286</vreference>
           </vacancy>
       </a10:content>
   </item>
   <item>
       <link>https://feedlink/item.com</link>
       <title>Item Title Two</title>
       <a10:updated>2019-09-19T11:53:35Z</a10:updated>
       <a10:content type="text/xml">
           <vacancy>
               <vacancyid>019623</vacancyid>
               <vtitle>Item Title Two</vtitle>
               <vacancypublishinfoid>1744392</vacancypublishinfoid>
               <vlocation>Location</vlocation>
               <vsalary>£10 ph</vsalary>
               <vexpirydate>07/10/2019 23:59:00</vexpirydate>
               <vmlocation>Location</vmlocation>
               <vmdiscipline>Vacancy intro</vmdiscipline>
               <vadvert>Main vacancy details</vadvert>
               <vreference>HCGWH464286</vreference>
           </vacancy>
       </a10:content>
   </item>
</channel>
</rss>

And this is the php I have in my WordPress template to pull content:

<?php
        include_once( ABSPATH . WPINC . '/feed.php' );

        // Get a SimplePie feed object from the specified feed source.
        $rss = fetch_feed( 'http://feedurl.com' );
        $maxitems = 0;

        if ( ! is_wp_error( $rss ) ) : 
            $maxitems = $rss->get_item_quantity( 3 );
            $rss_items = $rss->get_items( 0, $maxitems );
        endif;
    ?>

    <ul class="list">
        <?php if ( $maxitems == 0 ) : ?>
            <li class="post"><?php _e( 'No current vacancies', 'my-text-domain' ); ?></li>
        <?php else : ?>
            <?php 
                foreach ( $rss_items as $item ) :
            ?>
                <li class="post">
                    <div class="content-wrapper">
                        <div class="post-title">
                            <h3 class="label">Job Title:</h3> <span class="input"><?php echo $item->get_title(); ?></span>
                        </div>

                        <div class="post-description">
                            <h3 class="label">Job Description:</h3> <span class="input"><?php echo $item->get_description(); ?></span>
                        </div>

                        <div class="container">
                            <a class="apply-link btn round-btn" href="<?php echo $item->get_permalink(); ?>">Apply</a>
                        </div>
                    </div>
                </li>
            <?php endforeach; ?>
        <?php endif; ?>
    </ul>