NPB7 installing Promox 8.2.2 results in a system power-off

[sdnunda]

I'm trying to install Proxmox 8.2.2 on a NPB7 but when it reaches 99% it powers off. (with secure boot)
After boot nothing is installed.

Installing from bootable usb (rufus + iso).

System specs:
Intel® Core™ i7-13700H Processor
Built-in Iris Xe Graphics
32GB DDR5 RAM
2TB NVME SSD
4TB SATA SSD (disconnected)

FYI,

an installation of XCP-ng and windows 10/11 on the same system works fine. (with secure boot)

any help would be appreciated.