ERR_NGROK_27707: The API surface format "FORMAT" is not a supported ngrok format

What does ERR_NGROK_27707 mean?

ngrok returns ERR_NGROK_27707 with this message:

The API surface format "<FORMAT>" is not a supported ngrok format.

Troubleshoot ERR_NGROK_27707 with your AI agent. Connect it to the ngrok MCP server, then ask what caused the error and how to fix it.

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