ERR_NGROK_5116: An event destination may not specify more than one type of authentication - ngrok documentation

What does ERR_NGROK_5116 mean?

ngrok returns ERR_NGROK_5116 with this message:

An event destination may not specify more than one type of authentication.

Where can I get more help with ERR_NGROK_5116?

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