ERR_NGROK_1691: One of the SAML IdP Metadata or IdP Metadata URL properties must be specified - ngrok documentation

What does ERR_NGROK_1691 mean?

ngrok returns ERR_NGROK_1691 with this message:

One of the SAML IdP Metadata or IdP Metadata URL properties must be specified.

Where can I get more help with ERR_NGROK_1691?

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