ERR_NGROK_422: The reserved domain name update failed because no values were provided

What does ERR_NGROK_422 mean?

ngrok returns ERR_NGROK_422 with this message:

The reserved domain name update failed because no values were provided. Specify at least one value.

Troubleshoot ERR_NGROK_422 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.