ERR_NGROK_3117: The initial link used to authorize with PROVIDER had unsupported parameters - ngrok documentation

What does ERR_NGROK_3117 mean?

ngrok returns ERR_NGROK_3117 with this message:

The initial link used to authorize with <PROVIDER> had unsupported parameters.

Where can I get more help with ERR_NGROK_3117?

Email support@ngrok.com and include the error code.