Pardon if this is a repeat thread, I didn't see anything with a quick search.
I just installed OMV 4 on an extra Pi 3+ I had. I used Etcher to load the image to a SanDisk 32GB micro SD card, and watched it boot verbose. There were a couple errors that came up but it seemed to be things such as "Microtek Bluetooth Adapter" and the like that I'm not using.
After a verbose reboot with fewer errors, it popped up with the ASCII-character logo, a few more status lines on WPA Supplicant and the like, I was presented with an info and copyright line, and that was all in line with headless Linux distros I've played with on first boot so I assumed it was standard for this system. It then said to manage the system on the web control panel and displayed the MAC and IP address on the network, admin is account name, openmediavault is the password.
I tried logging in via SSH from my desktop with Putty. It would connect, accept admin as the user name, but would tag "openmediavault" as invalid and ask again. Thinking it might be an SSH configuration issue I went ahead and plugged in a USB keyboard. No love there either.
What might I be doing wrong here?