ERR_NGROK_208: The authentication you specified is actually an API key ID, not an API key token - ngrok documentation

What does ERR_NGROK_208 mean?

ngrok returns ERR_NGROK_208 with this message:

The authentication you specified is actually an API key ID, not an API key token. Your credential: <TOKEN>. Check your records for an API key with the form FIRSTPART_SECONDPART. API keys and instructions are available on your dashboard: https://dashboard.ngrok.com/api-keys

Troubleshoot ERR_NGROK_208 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_208?

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