Surface Pro 9, no OS installed

[Cullers]

I purchased a Surface Pro 9 with no operating system installed. I've tried to install windows via a usb both a Win 11 install and an Win 11 Arm64 version via usb. Neither get recognised. When I try and download the Surface Recovery Image software, I try and input the serial number of the Surface Pro 9 and the Windows site tells me "serial number combination are invalid."
Can someone please help?

 

[guymalloc]

I'd start with Windows 8 Pro myself, not as touchy. I assume you know how to boot into bios and disable secure boot. If you can get Win 8 to run, shouldn't be too hard to upgrade to 10 or 11.