mdadm – Why are Openmediavault Web GUI and SSH not running / operating when the RAID array is inactive?

My array is in inactive mode and I'm trying to reassemble it. My openmediavault 4.11 installation is on a separate hard disk. I can boot to the command line (with some errors regarding the array, I think). Normally, OMV is accessible via SSH and Web GUI, but this is not the case. So I wondered if there is another problem (apart from the array that is not ok).