I have some more information I found which seems similar.
https://forum.proxmox.com/threads/problems-with-gpu-passthrough-since-8-2.145917/
as well as this output:
dmesg | grep -i vfio
[ 4.824628] VFIO - User Level meta-driver version: 0.3
[ 186.437435] vfio-pci 0000:02:00.0: Firmware has...
Reinstalled Proxmox on an old host that I am running Truenas as a VM.
After updating the grub to include IOMMU commands:
Ran: Update-grub
rebooted
Added the modules to /etc/modules:
When I add the PCI device to the VM I get this error in Proxmox:
Here are some other logs that I may find...