Find my Iphone not working - says it's off line and it isn't

I'm checking that Find my Iphone is working, and it isn't. It's sitting in fornt of me and it's on line - everything is working fine on my WiFi network and I can surf the web. Location Services is turned on and Find My Iphone is turned on.

But when I log into Icloud on my Mac book Pro, also in front of me, it says my Iphone is offline. What's up? BTW, works fine with my Ipad.

Richard