No, they weren't, so now ssh is working (also changing the pw using passwd). Also with the correct password, but in the control panel, when I click on the eye to show the user's password, it still shows the root password. Maybe that's a bug in the web UI?
The users also weren't members of the sambashare group, but they never were before, and adding them didn't solve the problem. It's weird that accessing the SMB shares from Windows clients is working as before, but from the scanner it only works as root.