ERR_NGROK_4117: The email address EMAIL already exists under a similar alias

What does ERR_NGROK_4117 mean?

ngrok returns ERR_NGROK_4117 with this message:

The email address <EMAIL> already exists under a similar alias. Use that email address to login.

Troubleshoot ERR_NGROK_4117 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.