HD RSS Entry for 'Steal My Sunshine - Episode 03' is broken

I get the following in the HD RSS All Videos feed:

<item>

<enclosure url="?api_key={my_key}" type="video/mp4" length="8459"/>

<title>Steal My Sunshine - Episode 03</title>

<link>https://www.giantbomb.com/videos/steal-my-sunshine-episode-03/2300-12404/</link>

<description>Why have one button for punching grates when you could have two??</description>

<guid isPermaLink="false"></guid>

<pubDate>Wed, 26 Jul 2017 14:42:00 PDT</pubDate>

<comments>https://www.giantbomb.com/videos/steal-my-sunshine-episode-03/2300-12404/</comments>

<itunes:subtitle>Why have one button for punching grates when you could have two??</itunes:subtitle>

<itunes:duration>02:20:59</itunes:duration>

<itunes:explicit>no</itunes:explicit>

</item>

I've edited my API key out of the enclose url attribute.

The entry in the SD feed looks correct.