Geforce gt220 passthrough

Maybe you are using older drivers in which NVidia actively breaks passthrough? Maybe their newer drivers don't support your GPU? Maybe you need to hide the virtualization from the drivers?
Maybe the device does not reset properly? Maybe the GPU is used during the boot of the computer (single GPU)? Maybe you need to patch the ROM of the GPU?
It's hard to tell without seeing the VM configuration file. Personally, I know very little about NVidia but maybe someone knows which of the above applies to your GPU.
 
Is it even possible to pass through a gt220. I see it in windows but I'm getting error code 43
Yes, you wouldn't get error43 if passthrough didn't work. ;)

The GT220 is old, very old. EOL of driver was 342.01 on 2016.12.14.

Best recommendation I can give is get one listed in the attachment. With these you'll get 100% UEFI compatible vbios (some still need firmware: https://support.nvidia.eu/hc/de/art...e-Update-für-DisplayPort-1-3-und-1-4-Displays ) and the necessary driver after 2021/12 to get rid of error43 softlock.
 

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