ERR_NGROK_305
Message
Binding custom subdomains is a feature for paid accounts.
Failed to bind the custom subdomain SUBDOMAIN
for an unauthenticated client.
Sign up at: https://dashboard.ngrok.com/signup
If 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
Further help
If you're having trouble resolving this error, please reach out to support@ngrok.com
Additional Information
Binding a custom subdomain on an ngrok 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 https://dashboard.ngrok.com/signup You'll need the Basic plan or better.
Add the authtoken from your account dashboard to your ngrok agent in your terminal.