Windows Server 2019 DDA

So, I’m trying to pass-through my RX 590 onto a windows 10 guest. I followed the Microsoft DDA document and managed to dismount my gpu and assign it to the VM but when I try starting it, it gives me the following error: The operation failed because the
object was not found. After digging through the logs, I found a more detailed error message saying: Could not allocate the PCI Express device with the Plug and Play Device Instance path ‘PCIPVEN_1002&DEV_67DF&SUBSYS_C4111462&REV_E14&288640B9&0&001A’
because it is already in use by another VM.

The thing is, I definitely don’t have another virtual machine. I did enable IOMMU, ACS and SR-IOV beforehand.

Here are my specs:
MB: X570 Taichi
CPU: Ryzen 3900X
GPU1: RX 5700 XT
GPU2: RX 590

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