No, you cannot operate a UniFi access point via PoE on this switch. The switch only has 1 PoE port to the outside, not all ports. It itself is operated via an external power supply (USB or PoE input) and then only supplies devices with up to 6.4 W (802.3af) via this one port. The other 4 ports are pure data ports without PoE output. For an AP, you typically need a PoE-capable switch with more PoE power.