Hi, I use RB2011U/AS-RM and has 24V 1,2A power supply.
In port 10 i have an HPE OC20 access point. 5 meter Cat6 cable connects them (26awg*4pair).

OC20 follow IEEE 802.3af/at and require PoE 57 VDC, 350 mA.

poe-out-status changes between "powered-on" and "Waiting for load"

I have try other cables without any results.

From Mikrotik manual:
PoE-Out port limitation
PoE-Out ports are limited with max amp values which are supported in particular voltage, usually max current will differ for low voltage devices (up to 30 V), and for high voltage devices (31 to 57 V).


Someone who has an idea of what's wrong?

RB2011 PoE Out is Passive only, not af nor at, you can't use a RB2011 to power the HP.

You need to either get an standalone PoE af injector, or use a different Router which supports PoE Out af/at, like an hEX PoE

Ok, Thanks
From https://mikrotik.com/product/RB2011UiAS-RM: "There is PoE output function for port #10 - it can power other PoE capable devices with the same voltage as applied to the unit. Maximum load on the port is 500mA.".
It means only PoE out 24 VDC?

Yes, if using the stock Power adapter.