This is actually quite frustrating. On 2013 rMBP running yosmite DP6 and my IP 5s (beta5) it just seemed to work. But I am using a work 2011 MB air with yosmite DP6 and an IP5 (beta 5) and I cannot seem to get it going. According to the system report on the air the BT LMP version is ox6 so it has the right version. I have both the air and IP on the same wireless network and have bt turned on. Handoff is turned on on the iphone. The same apple id is signed in on both devices. What I cannot find is 'handoff' in the general tab of system properties of the air. If I search for it, spotlight says it is in the general tab, but I cannot find it. I have no idea what I am doing wrong.