U4025QW, Windows OS DDPM, Network KVM not working (anymore)

for starters, it did work once, but only once.

Afterwards I updated to DDPM (from ddm) and I think I updated the firmware of the monitor (maybe I already did this not sure), but now there is no way I get it to work.

laptop1: Asus, windows 11-64 with hdmi and usb-c.

laptop2: Dell, windows 11-64 with usb4/thunderbolt.

Hopefully there is a bug in the new DDPM, cause this should work.

Even tried going back to ddm, but with no result. Cannot get it back to work.

anybody same issue?