Amazon Links Not Working

Trying to add this script to an in post ad. It won't show. However, it does show if I post directly into a post.

Here is a test post:

Please advise:

<script type="text/javascript">
amzn_assoc_placement = "adunit0";
amzn_assoc_tracking_id = "bonniemacsatt-20";
amzn_assoc_ad_mode = "manual";
amzn_assoc_ad_type = "smart";
amzn_assoc_marketplace = "amazon";
amzn_assoc_region = "US";
amzn_assoc_title = "My Amazon Picks";
amzn_assoc_linkid = "9af908bb689d9b1d1ed28df76bd11767";
amzn_assoc_rows = "4";
amzn_assoc_design = "text_links";
amzn_assoc_asins = "B01M22K4DM,B008YEXC22,B00EZI26DW,B007I5NXY0";
<script src="//"></script>