Hi xynobis,
It sounds like you're having trouble with the NBC Sports website working, and I want to help.
Which web browser are you using to view the website?
Safari should be compatibly according to their site:
NBC Sports Live Frequent Asked Questions (FAQs) and Customer Support | NBC Sports
If you're using Safari, try clearing the website data for NBC Sports and trying again.
You can do so in Safari by choosing from the menu bar Safari > Preferences > Privacy > Manage Website Data.
From there search for the NBC website and remove the data.
Here's more info on that:
Manage cookies and website data in Safari on Mac - Apple Support
Restart your Mac and try again after that.
Let me know if that helps you get that working correctly.
Thanks for using the Apple Support Communities.