iGPU Passthrough: Machine won't start after adding PCIe device

I have a ASRock N100m mainboard/cpu, that should support iGPU passthrough just fine. To enable this functionality, I followed these steps:

1. Update GRUB config to add Kernel parameters
2. Adding VFIO modules
3. Blacklist i915

(As described here: https://peanut-tech.com/how-to-pass-through-intel-igpu-to-proxmox-virtual-machine/)

After rebooting Proxmox, I can now add the PCIe device to my VM (Raw device with proper address, all function, ROM-Bar, PCI Express all enabled).
I...

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