Du vill nog koppla kabeln från switchen till accesspunktens PoE adapter sedan till "mainporten" på accesspunkten.
Nu gissar jag att du har kopplat switchen till "secondary porten" på accesspunkten och PoE adaptern till main, du borde ha ett oanvänt uttag på adaptern.
Från deras hemsida:
Secondary UAP Ethernet ports don't provide PoE passthrough (to run current to a second powered device), but they do support data passthrough. It serves as a bridged interface between main / secondary Ethernet port.
This means users can connect the PoE cable to the main Ethernet port to supply power, then connect another, non-PoE device (e.g., IP camera, extra UAP) to the secondary Ethernet port to bridge connections.
http://www.broadbandbuyer.com/images/products/ubiquiti/unifiacpro-7.png?width=400