ERR_NGROK_4453: A similar email address to the one being verified, EMAIL, belongs to another user - ngrok documentation

What does ERR_NGROK_4453 mean?

ngrok returns ERR_NGROK_4453 with this message:

A similar email address to the one being verified, <EMAIL>, belongs to another user.

Troubleshoot ERR_NGROK_4453 with your AI agent. Connect it to the ngrok MCP server, then ask what caused the error and how to fix it.

Where can I get more help with ERR_NGROK_4453?

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