AdSense not showing on Sidebar 2

When I add a google AdSense Ad to the sidebar-2.php, it works fine on all posts except it does not show up on the front page.

I am currently inserting the following into sidebar-2.php:

<script async src=”//pagead2.googlesyndication.com/pagead/js/adsbygoogle.js”></script>
<!– 200x200Square –>
<center>
<ins class=”adsbygoogle”
style=”display:inline-block;width:200px;height:200px”
data-ad-client=”ca-pub-2016667189184986″
data-ad-slot=”3281349754″></ins>
</center>
<script>
(adsbygoogle = window.adsbygoogle || []).push({});
</script>

Also, I am trying to use a sidebar-2.php in a child theme so it does not get overwritten when I update the theme, but that does not work either. I can only get an ad to show up if I insert the previous code into the main theme.