Are you talking about Live?
There is a topic in the Android App group and I have seen a couple in the main forums. Staff was aware of it at the time and I haven't seen any updates on the issue.
I don't play Live often, and have never done it on my Android. Just tried getting to Live and it took a few tries to get it to come up. But it ended up loging in.
Anyway, the best place for Android application issues would be that group's forum or possibly the Help and Support section on the main forums.
Is not functioning right. There are some login issues and I can not play multiplayer games. Other users are also complaining about other issues.
Can someone look into it please? I would love to play some chess on my tab.