Only Personal, Pro, Enterprise, and Pay-as-you-go plans may use custom hostnames.
Failed to bind the custom hostname HOSTNAME for an unauthenticated client.
Sign up at: https://dashboard.ngrok.com/signupIf you have already signed up, make sure your authtoken is installed.
Your authtoken is available on your dashboard: https://dashboard.ngrok.com/get-started/your-authtoken