ERR_NGROK_6527: The id ID is invalid; expected an id of type BACKENDTYPE backend

What does ERR_NGROK_6527 mean?

ngrok returns ERR_NGROK_6527 with this message:

The id <ID> is invalid; expected an id of type <BACKENDTYPE> backend.

Troubleshoot ERR_NGROK_6527 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.