@Kevin31 all 9300s that supply power are either PoE+ or UPoE
@Dennb10 it could be one of a few things please try the APs that show low power on a direct connection to the switch, if this works then test/repair/replace the patch cables and structured cabling. If the cable has too high a resistance the power may not be getting through. If the AP is no better connected directly to the switch try a different port, if still no better a different switch. Also make sure that you aren't using more power than the switch can deliver, a 48 port switch full of PoE+ devices can be supplying 1000W or more and depending on the PSUs in the 9300 this may or may not be achievable.