ERR_NGROK_SHIP_ENDPOINT_TEMPLATE_NAME_BAD_START: Endpoint template name NAME must start with a lowercase letter - ngrok documentation

What does ERR_NGROK_SHIP_ENDPOINT_TEMPLATE_NAME_BAD_START mean?

ngrok returns ERR_NGROK_SHIP_ENDPOINT_TEMPLATE_NAME_BAD_START with this message:

Endpoint template name <NAME> must start with a lowercase letter.

Where can I get more help with ERR_NGROK_SHIP_ENDPOINT_TEMPLATE_NAME_BAD_START?

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