Airport Express on PoE Switch

Hello,

I had a quick question that maybe someone can help me with. We have a location that I am using multiple Airport Express Base Stations to extend the wireless throughout the warehouse. A few of these are connected by Cat6 to a power over ethernet switch. I am having issues with them working. The other ones are working well but the three that are connected to the PoE switch don't show up in the Utility. I have tested these plugged into a regular switch and they seem fine and show up. Is there an issue with running these AEX to a PoE switch? Will the PoE damage the airports or just cause interference? I have been looking around and can't find an answer anywhere. All help is appreciated