ERR_NGROK_1644: Invalid endpoint configuration, OAuth provider PROVIDER contains an email domain with invalid punycode: NAME - ngrok documentation

What does ERR_NGROK_1644 mean?

ngrok returns ERR_NGROK_1644 with this message:

Invalid endpoint configuration, OAuth provider <PROVIDER> contains an email domain with invalid punycode: <NAME>.

Troubleshoot ERR_NGROK_1644 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_1644?

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