Unable to mount a DroboPro FS share to Linux

Goal: mount a share from my DroboPro FS to my Fedora 30 Desktop.

I’ve created a share called fedora_desktop. The share is owned by Admin and user access is set to “Everyone”. I have assigned the share to letter “K”. The Drobo ip address is

This is the command I’m using on my Fedora desktop to mount the share: (passwd obfuscated)
mount -t cifs -o Admin, mypasswd // /mnt/drobo

I get a prompt:
Password for root@

I enter the Admin password

I then get a mount error (22): Invalid Argument

What can I do to fix the problem?