Net use command on Citrix Metaframe XP

I am trying to use the command:

net use s: \\mdc-citrix[\Annuity Extracts]

For some reason I get an error stating the "Network name cannot be found"

mdc-citrix is my server and Annuity Extracts is my share. I have people mapped to s: but would like to automate this via login script. I am trying to get it right on the command line before I move it into a bat file. Right now I get that error when I type the command in the command window. Any suggestions?