ERR_NGROK_307: You must reserve an address for your account before it can be used

What does ERR_NGROK_307 mean?

ngrok returns ERR_NGROK_307 with this message:

You must reserve an address for your account before it can be used.
Failed to create the address <ADDR> for the account <ACCOUNT> in region <REGION>.
(Hint: Did you reserve the address in this region?)

Reserve an address on your dashboard: https://dashboard.ngrok.com/tcp-addresses

Troubleshoot ERR_NGROK_307 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_307?

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