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Symptoms of issue. AP will not power up using active POE/POE+ switch but powers up using passive POE power brick.
To confirm diagnoses you will need multi meter and carry out resistance check via RJ 45 connector. Key pins are 1,2 and 3,6. Both pin pairs when testing with DMM will show as almost 0 ohms - this is normal, if you test pins 1 and 3 or 1 and 6 or 2 and 3 or 2 and 6 and your DMM shows less then .5MegOhm then read on.