Unable to Create Workspace Flow Add-On

Having followed the instructions in the documentation for Workspace Studio Add-Ons they just don’t seem to work. I have access to Studio in my account, I can use the tool, but neither my own add-on nor Google’s provided code result in showing a add-on in the flow.

Quickstart: Build a calculator step with Google Apps Script  |  Google Workspace add-ons  |  Google for Developers outlines how to get started, and gives the steps to implement the calculator. Nothing appears in the flows.

What am I doing wrong, or is this just broken?

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