ERR_NGROK_5304: Could not find the domain "DOMAIN" specified in the IdP-initiated RelayState - ngrok documentation

What does ERR_NGROK_5304 mean?

ngrok returns ERR_NGROK_5304 with this message:

Could not find the domain "<DOMAIN>" specified in the IdP-initiated RelayState.

Troubleshoot ERR_NGROK_5304 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_5304?

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