Greetings,
I think this could be a few things. I would start by simply ssh'ing into the box and try the commands there. Look for anything strange about the volume name? That could throw errors if they have a unexpected char.
ssh commands to run
vol status Subsurface
snap server Subsurface 10
snap sched Subsurface 0 2 6@11,15,21
Hope this helps.
John