setting workflow variable from a rest invocation of a workflow

I’m following the example in

on setting a value to globally set workflow variables, using &wv:=.

I have a workflow with a workflow variable NAVDate as a string variable, and I’m call the workflow with the URL


I get the following error message


The variable NAVDate is set as a workflow variable, and then the workflow deployed to the server.

How can I set this so that the workflow can start with it?


found an older conversation which answered this, sorry. However, I have followed up with a request of clarity on what happens if you remove workflow variables.