Restore Nvidia K80 GPU from Hyper-V to 2019 host loses 1 GPU

Hello, Tried assigning this dual GPU card to use in a hyper-v VM. My attempt failed, so removed it back to the host and for some reason it is now showing only 1 GPU in device manager. Checked to be installed OK in the PCI port, power, etc.

Could it got damaged in the process of assigning it to the VM? Typed only commands in Windows 2019.
Is there a diagnostic tool; how to test if the hardware is OK?