Unfortunately MLB "tested" their app on, what appears to be, whatever was around the office. The Fire is approved yet our Tablet isn't. I have a T-Mobile GS2 that isn't on the approved video list yet the AT&T version is. Last year they had an approved list...but allowed other to try with a disclaimer. I've written them regarding this.
I tried using the Dolphin browser set as Desktop and was able to connect. Unfortunately, CM7 video acceleration isn't up to par yet (hopefully soon) so I had a clear but choppy picture. It did, however, look great in my phone