Try this:
sudo rm /etc/systemd/network/99-default.link
sudo netplan apply
sudo omv-salt deploy run systemd-networkd
Thank you very much ryecoaaron !
I had the same issue while trying to add the ethernet (eth0) interface (as stated in official documentation https://github.com/OpenMediaVa…ing_OMV5_on_an%20R-PI.pdf) with OMV 5 on my RPi 4B.
Trying these commands have fixed the issue.
I guess it is not the "normal" behavior as I cannot see any warning on official documentation and it seems to be working like a charm in this video.
Thank you anyway