ERR_NGROK_SHIP_GATEWAY_CONFIG_UNSUPPORTED: A SCHEME endpoint can't use these gateway settings: SETTINGS - ngrok documentation

What does ERR_NGROK_SHIP_GATEWAY_CONFIG_UNSUPPORTED mean?

ngrok returns ERR_NGROK_SHIP_GATEWAY_CONFIG_UNSUPPORTED with this message:

A <SCHEME> endpoint can't use these gateway settings: <SETTINGS>. Remove them, or use an https:// URL.

Where can I get more help with ERR_NGROK_SHIP_GATEWAY_CONFIG_UNSUPPORTED?

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