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“The boot loader did not load an operating system” for windows 10 hyper-v VM

I created a vhdx file from the c: drive from a lenovo P1G3 a while back and thought I had a working VM from it, but apparently not. Now when I try to boot the VM I get the “The boot loader did not load an operating system”. The host is a win10 using the Hyper-V manager, and the VM is set to gen2 with the secure boot disabled. The vhdx file does not look to be corrupt, as I can attach and browse the files without any errors. I’ve tried the basic windows install iso –> “Startup Repair” but no luck. I’ve gone around in circles trying to use the bootrec, bcdboot, diskpart, etc… utilities per various superuser and similar forums, but I cannot figure out what is needed, and I’m pretty spun around wondering if I’m even starting in the right place.

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