You could say "Gate pass has not been issued" if it is a short notification needed by a machine at a gate, but not "Gate pass is not issued".
However, if it was to be a sentence you would say.
A gate pass has not been issued. This sounds better and more polite.
If a gate pass won't be issued you would say for example. A gate pass won't be issued, because you have to work here to get one. OR A gate pass will not be issued.