ERR_NGROK_417: This wildcard domain would conflict with a domain reserved for another account - ngrok documentation

What does ERR_NGROK_417 mean?

ngrok returns ERR_NGROK_417 with this message:

This wildcard domain would conflict with a domain reserved for another account. Failed to reserve <DOMAIN>.

Troubleshoot ERR_NGROK_417 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_417?

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