It seems like their script wants you to explicitly set the height/width of the box it’s in.
You can add the following to the start of your custom tile and it should fix the issue:
<style>
html,body { height: 100vh; width: 100vw; margin:0;padding:0;}
</style>
So the full snippet in your case would be:
<style>
html,body { height: 100vh; width: 100vw; margin:0;padding:0;}
</style>
<div class="scorestream-widget-container" data-ss_widget_type="teamSchedule" data-user-widget-id="48317"></div><script async="async" type="text/javascript" src="https://scorestream.com/apiJsCdn/widgets/embed.js"></script>