> ## Documentation Index
> Fetch the complete documentation index at: https://ngrok.com/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Error 307

## ERR\_NGROK\_307

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](https://dashboard.ngrok.com/tcp-addresses)

## Further help

If you're having trouble resolving this error, please reach out to [support@ngrok.com](mailto:support@ngrok.com?subject=Help%20with%20ERR_NGROK_307)