Thank you for your diagnosis. In the end, the problem was related to option 1: the guy who punched the cables did it incorrectly, so although there was PoE there was no communication available. I punched the cables correctly following the T-568B standard and everything worked like a charm.
I have a recent problem with a Hikvision PoE switch DS-3E1105P-EI/M that needs to feed a IP Door Intercom with DS-KH6320-WTE1 as a touchpad. Over short distances (<2m) the switch feed the power and the touchscreen identifies the ringbell connected to the switch, meaning it finds it on the...