ERR_NGROK_SHIP_CHECK_NAME_BAD_START: Health check name NAME must start with a lowercase letter - ngrok documentation

What does ERR_NGROK_SHIP_CHECK_NAME_BAD_START mean?

ngrok returns ERR_NGROK_SHIP_CHECK_NAME_BAD_START with this message:

Health check name <NAME> must start with a lowercase letter.

Where can I get more help with ERR_NGROK_SHIP_CHECK_NAME_BAD_START?

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