Mac won't see 5N for Time Machine

Just set up a brand new 5N, I created a share for a Mac with Time Machine enabled. Went to the Mac and logged in and can see the Share I created for the Time Machine in finder. However when I go to set up the Time Machine preferences and select a disk it’s not there to select.

Help please

Try mounting it. Check on the checkbox in Drobo Dashboard > Shares.

When setting it up for the first time, TM would prompt a username and password.
This refers to the credentials of your admin user for the Drobo Dashboard.

The share is mounted but when I go to TM it doesn’t see the drive at all, if i plug it directly into the imac it sees it but not through the network connection

thanks! this helped my problem, dont know why it logged me out!