Only paid plans may bind custom subdomains. Failed to bind the custom subdomain <SUBDOMAIN> for an unauthenticated client. Sign up at: If you have already signed up, make sure your authtoken is installed. Your authtoken is available on your dashboard:

Further help

If you're having trouble resolving this error, please reach out to

Additional Information

Binding a custom subdomain on the domain requires a paid plan. Once you sign up for a paid plan, we'll give you an authtoken that you'll add to your ngrok agent. This will allow you to use custom subdomains.

Possible Solutions

Sign up for a paid plan at You'll need the Basic plan or better.

Add the authtoken from your account dashboard to your ngrok agent in your terminal.

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