find my iPhone does not work on iCloud

Hello Apple geeks!

I have a serious problem to resolve in regard to iCloud and locating devices. Since the move from mobileme to iCloud the locating of devices such as iPhone and iMac does not work. It said that my devices are offline whereas there are right switched on and in use. I have Lion 10.7.3, I have 2 accounts 1 in mobile me and 1 in iCloud using the same user name and password. But now only iCloud can be use for locating devices. Since the upgrade to Lion OX 10.7, iCloud installed and superseded mobile me. In System Preference I can now only access iCloud as mobileme is gone.

Also worth to mention, Find my iPhone on iPhone 4 does not work either...

Anyone knows where the problem might coming from.