HAOS will not boot on an Acer RB610 i5 16gb ram, any suggestions?

I’m trying to run HAOS on this Acer rb610 machine, but it will not boot from the internal nvme disk, I have tried several different ones.
It runs well when I boot from an external USB-c nvme adapter.

Any body that can point me in the right direction why this doesn’t work ?

Did you disable secure boot?

Yes, I did that. But I gave up on this machine. I found another machin in my archive. wich is running HAOS perfectly. but it’s a massive overkill. desktop 10.gen i5 12 core

How about trying proxmox? You’ll be able to run some other things on that, too… no harm on trying, right? I ran HA directly on my intel nuc i7, too, but later switched to proxmox. If nothing else i can hard-reset HAOS remotely (so basically simulate haos power off/on), which can’t be done if running haos directly (in case if, say, it totally blocks…)