This seems like some authentication information is missing. Can you share the error logged on Service Center?
Did you check this part on the component's description?
See What You Can Do:
https://developer.autodesk.com/
Change Site Properties with your own Autodesk Forge App Client ID and Client Secret
Configure your Autodesk Forge App Callback URL to Web Screen "Callback" to use the 3-Legged Token with authorization screen.
The secret and Client Id are OK, and I configured the Callback URL..
Javi.