ERR_NGROK_SHIP_ENDPOINT_URL_SCHEME_UNSUPPORTED: The FIELD value VALUE uses the unsupported scheme SCHEME - ngrok documentation

What does ERR_NGROK_SHIP_ENDPOINT_URL_SCHEME_UNSUPPORTED mean?

ngrok returns ERR_NGROK_SHIP_ENDPOINT_URL_SCHEME_UNSUPPORTED with this message:

The <FIELD> value <VALUE> uses the unsupported scheme <SCHEME>. Allowed: https://, tls://, or tcp://.

Where can I get more help with ERR_NGROK_SHIP_ENDPOINT_URL_SCHEME_UNSUPPORTED?

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