POE devices plugged into the ISW, that otherwise work with other POE switches--or injectors will not come up when plugged into the ISW. "Invalid PD" is reported in the ISW CLI and GUI for POE status on the port.
This comes down to the switch not being able to provide enough power for the powered device.
Make sure the reserved power is no more than needed to power other powered devices. After checking this, if the message is still displayed, its possible that the ISW needs more power--so an upgraded PSU (with higher wattage) would be necessary.