UAP-AC-M - does not support zero handoff / mobility ???

Hi, I had a look at the manual upfront and the UAP-AC-M is NOT listed NOT to support mobility/zeo handsoff.

I have updated to the latest firmware to latest 3.8. 

I specifically bought them to get this feature. But the Wlan Group I have created for Mobiltiy are not listed.

What I am doing wrong?