Unable to add Switchbot devices via Bluetooth

Hi all! I’m running HA in a Proxmox VM. I have passed to it a Mercusys MA530 bluetooth adapter, cause i was having troubles with the wifi card’s bluetooth.

The adapter is recognized correctly, but when i try to add the Switchbot integration it says that can’t find any device nearby (they are literally 1 meter apart).

In terminal i run bluetoothctl → scan on and i can see the switchbot devices mac addresses, but if i try pair i get org.bluez.Error.AuthenticationFailed

Any idea on how to solve?