This article explains how to find your Workspace / Server name which is also important to know when logging-in to the Workforce App.

Step 1: login into your server

Step 2: See the URL field on your browser

Step 3: you'll find that anything prior .onuptick.com is your workspace / server name.

As seen in the example below, the URL says: osl-sandbox.onuptick.com. This means that osl-sandbox is the workspace / server name.