AP cannot run when connecting to the poe switch?

1.If POE enable is enabled on the port of the switch, the newly added aps cannot supply power and you need to remove other aps that can supply power. In this case, check whether the POE power is sufficient.
Ruijie#show poe powersupply

If the remaining power is insufficient, it indicates that the power is insufficient. The AP or switch needs to be replaced.
2.If the total power is normal but the device port fails to supply power, you need to enable the poe compatibility mode and check whether it is normal:
(1)Enable the POE power saving mode (enabled by default for the 11.X software version).
Ruijie(config)# poe mode energy-saving
(2) Enable the non-standard POE mode
Ruijie(config)#poe legacy
Ruijie(config-if)#poe legacy -- Some switches need to enable non-standard mode on interfaces
Note: Running this command on a port that is not connected to a PD device may cause the peer device to be burned by incorrect power-on. Make sure to use this command when the port is connected to a PD device.
(3)The Poe power is normal, and the compatibility mode is enabled. However, the port or the whole device fails to supply power
AP Switch port method (no power supply for some ports)
Switch the AP port connected to the normal power supply port to the AP port connected to the non-power supply port.
a. If a normal AP is connected to an unpowered port and can receive power normally, the switch port is not faulty. If an abnormal AP is connected to a port that can supply power, the AP is faulty.
b. If a normal AP is connected to a port without power supply and the power supply sequence of the device and the switch remains the same after replacing the network cable, you can determine the POE fault of the port of the switch and apply for maintenance. http://www.ruijie.com.cn/fw/wxzhx/
Switch Replacement of the same Model (If the overall POE does not power supply)
Connect the power receiving device to a POE switch of the same model and version.
a. If the AP still fails to receive power, determine that the AP is faulty and connect a new AP to a POE switch.
b. if the AP can be normal electricity, can switch POE fault judgment, may apply for the maintenance and daily maintenance connection: http://www.ruijie.com.cn/fw/wxzhx/