@roxie how did you set up the bridge?
@roxie way i did it is systemd-networkd
/etc/systemd/network/10-bridge.netdev
[NetDev]
Name=vmbridge
Kind=bridge
/etc/systemd/network/20-bridge.network
[Match]
Name=vmbridge
[Network]
DHCP=ipv4
/etc/systemd/network/30-ethernet.network
[Match]
Name=enp37s0
[Network]
Bridge=vmbridge
then, in virt-manager i just select vmbridge as the bridge device and it works,
