Off hand I don't see anything immediatly wrong. Try this, and see what it returns:
on *:JOIN:#dutch: { /msg $chan $nick $iif($ulist($fulladdress,999,0),has,doesn't have) access. }
If people with and without access come up as having no access, the it's a level problem. If the cript doesn't trigger at all, you have another on join above it in the same file, and you need to either combine the two, or move this to another script.
