@zadok_ahiya Right. 6.5W should be no problem, so there may be something else going on. It looks like maybe that model is expecting passive POE. I see there are Ubiquiti adapters for that, but I would have to defer to Ubiquiti. I would recommend opening a case with them and asking about active/passive POE for this specific AP model. They should know if a switch is compatible or if it needs an adapter to work.
Ben Beck, RCNA, RCNI, Principal Technical Support Engineer support.ruckuswireless.com/contact-us