I’m making a GET request to the URL in that workflow in my web browser, and I’m getting back:
I can’t actually click the virtual button in your workflow and fire it as I can’t log in to your sandbox account to do so; my best guess is your URL includes a question mark that needs to be escaped in the ‘t2mpassword’ query parameter.
You’re saying “I don’t get any thing back” in the debug window. Are you actually getting no output, as no debug message is coming through? Or is it just not what you expect to get returned. If you’re getting a debug message, can you paste its contents here? (Make sure to remove any sensitive info before doing so.)