MLB TV app not showing up

I use SD menus on my TiVo Premiere Elite. When I go to the Video on Demand menu, there is no mlb.tv app there. I have xfinity on demand, hulu plus, Amazon, netflix, YouTube, and video podcasts. How do I get the mlb app to show up? I could see it when using the HD menus, but I had to switch back to SD for other reasons...