Cannot turn on iTunes Match on iPad

I have subscribed to iTunes Match on my Mac and that works fine. When I try to turn on iTunes Match in on my iPad 2 with iOS 5, I get the the error message "You are not currently subscribed to iTunes Match. Use iTunes on your computer to subscribe".If you have the some issue, launch iTunes on your iPad and scroll to the bottom. You will see that you are logged in as "ID@mac.com". Just sign out