ERR_NGROK_638: Your account is not allowed to create credentials with pre-computed tokens - ngrok documentation

What does ERR_NGROK_638 mean?

ngrok returns ERR_NGROK_638 with this message:

Your account is not allowed to create credentials with pre-computed tokens. To create a new credential, omit pre-computed token field and let ngrok generate one for you. Its value will be available as part of the response.

Troubleshoot ERR_NGROK_638 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_638?

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