Control of infrared device (Optoma beamer)

Hi all, I try to control my Optoma GT5500 (a beamer UST) with my homey pro 2023 using IR.

I can : add the device from (add device > ir > optoma > GT series).

It’s possible to control the device when it is already turned ON (so i can turn it off, change volume, brightness,…) but it is not possible to turn it ON through my Homey pro.

Any idea ?

Thanks ++