If I make the call from the Get Jobs activity it fails with the same error that yours did.
If I use an HTTP Request activity I get an Error 1101 which I solved using the fix here which says to add an organization unit header. Once the header is added the call is made just fine.
If I make the call from Postman it works fine without the Organization Unit header.
I’d recommend going route 2 for now, authenticate and make the API call through HTTP Request activities and I think it will work for you.
I think you are using the wrong words for ProcessName. Try something like this, which is from some of my code I used to find all jobs that are already running: