Attach wrong interface (physical instead of bridged)

I made a big mistake by attaching a bridged interface to a LXD container : I use the physical interface instead of the bridge interface :

lxc network attach eth0 my-container eth0

Instead of

lxc network attach lxdbr0 my-container eth0

Since then, my server no longer accesses the network (it is a dedicated server) and no longer recovers its IP configuration after a restart.
Do you have any idea how to solve this problem?
Thanks in advance, I’m a little desperate…
System : Ubuntu 20.04 - LXD 4.0.9

Here’s what ip a says

2: eth0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN group default qlen 1000

ip link set eth0 up doesn’t work. if up send DHCPDISCOVER but no response (the DHCP doesn’t recognize the card ?).

What bridged attache modifies for an interface to broke it ?

I feel like realy stupid with my mistake…

Do lxc config device remove <instance> eth0 and then you’ll likely need to rename the interface back to its original name using ip link set eth0 name <new name> and/or reboot to have the host network config be applied.

Thanks for your answer.
I called this morning the company where I rent the server, and after some manipulations, they realized that the problem came from the virtual port where the server was connected.
I’ve been up all night stressing for nothing…