Can Bluetooth be used in Proxmox (passed to a VM or LXC)

the pcie and usb device are the only things you can pass through. if it doesnt work, its most likely an issue within homeassistant.
have you checked the logs/console there?

i am using some realtek based usb bluetooth for homeassistant.
my intel card is reserved for windows 11 vm, where it works perfectly fine.
 

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