You can try powering the miner using USB C (skip the POE adaptor) as illustrated in the following image:
The miner can be powered from USB-C connector since it does implement USB PD rev 2.0 and is interoperable with USB PD rev 3.0 standard up to 22V.
If the miner is powered up and showing green light on USB-C connection, the POE adaptor is defective. Please reach out to Support team for further assistance via the Tech Support Center