What Streaming Services can I get with T-mobile Internet?

I took advantage of the MLB offer that T-Mobile offers annually, so all out-of-market games are available to me, both live and as an archive. What I'm curious about is that you can't subscribe to Hulu Live TV? I happen to subscribe to Hulu ad-free and YouTube TV and haven't had any problems.

I can't imagine that Hulu won't let you upgrade based solely on the fact that you have T-Mobile as your provider. That just doesn't make sense. What error message do you get when you try and upgrade?