ERR_NGROK_5311: The SAML IdP sent an invalid SAML assertion with N Authn statements

What does ERR_NGROK_5311 mean?

ngrok returns ERR_NGROK_5311 with this message:

The SAML IdP sent an invalid SAML assertion with <N> Authn statements.

Troubleshoot ERR_NGROK_5311 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.