PHP Notification Page - Table not displaying Results - php

Question

I've created a notification script and I have a page called notificationCenter.php where the admin user can view ALL the notifications. It will display which users have read which notifications, when it was posted and who by. Everything works fine with it, the only issue is when I go onto the notificationCenter.php page to view all notifications, the table doesn't display the results. However I run an if statement to check if there are any results and I don't get any errors. Here's my code, I'm sure I've done something stupid but I can't see what it is, I'd really appreciate any help!.
//Get User ID
$id = $_SESSION['user_id'];
//Select * Notifications
$notQuery = $serviceConn->query("SELECT * FROM db759709251.notifications WHERE `not_viewedby` NOT LIKE '%$id%' ");
<h4>Nofication Center</h4>
<?php if($notQuery->rowCount()) { ?>
<table>
<thead>
<tr>
<th scope="col">Status</th>
<th scope="col">User</th>
<th scope="col">Notification</th>
<th scope="col">Date</th>
<th scope="col">Viewed By</th>
<th scope="col"></th>
</tr>
</thead>
<tbody>
<?php
while ($row = $notQuery->fetch()) {
$notid = $row['not_id'];
$notUser = $row['not_user'];
$notMsg = $row['not_msg'];
$notStatus = $row['not_status'];
$notDate = $row['not_date'];
$notViewedby = $row['not_viewedby'];
?>
<tr>
<td style="background-color: <?php echo $statusColour; ?>" data-label="Status"><?php echo $notStatus; ?></td>
<td data-label="User"><?php echo $notUser; ?></td>
<td data-label="Notification"><?php echo $notMsg; ?></td>
<td data-label="Date"><?php echo $notDate; ?></td>
<td data-label="Viewed By"><?php echo $notViewedby; ?></td>
<td data-label="">
<form action="" method="POST">
<input type="hidden" name="notificationID" value="<?php echo $notid; ?>" >
<input type="hidden" name="notificationBy" value="<?php echo $notViewedby; ?>">
<input type="submit" name="read" value="Dismiss!">
</form>
</td>
</tr>
<?php
}
?>
</tbody>
</table>
<?php } else { ?>
<p>You currently have no notifications, please check back later.</p>
<?php } ?>
Now obviously there is a lot of HTML in the middle for styling and layouts, but I didn't think it was important enough as it shouldn't have any effect on the output of the table. But as you can see the if statement SHOULD print that there are no notifications and to check back later, and it doesn't so in theory there should be records to display.