i am having the same problem. all i did was to write "local" in the domain name. it was not possible to access the system again. (it does not get ip from dhcp) i am using raspberry pi 4 and openmedivault 7.1.0. i don't know what is on the screen because the system is headless. but i can open the sd card in another linux system. how can i revert the change i made in this case? i am running many containers on docker and i spent a lot of effort for them. thanks.
You can connect to a screen and run omv-firstaid and reconfigure network. after that you will have access to xxx.local