Cannot auth using developer rig (github version)

When using the old developer rig which I cloned from github, I put in the client ID, the api secret and the version and I click Fetch and it gives “Auth Failed” as the result from the server. It works fine for another developer on the project but not for me. I have tried multiple times to regenerate the secret and even to make a brand new extension with a new client ID, no combination of client ID and secret ever gives anything except “Auth Failed”.

The Github version is dead.

Please use the Native Rig