ERR_NGROK_SHIP_ENVIRONMENT_CONTINUOUS_DELIVERY_NOT_CONFIGURED: Environment ID has no continuous delivery, so it cannot be rolled back - ngrok documentation

What does ERR_NGROK_SHIP_ENVIRONMENT_CONTINUOUS_DELIVERY_NOT_CONFIGURED mean?

ngrok returns ERR_NGROK_SHIP_ENVIRONMENT_CONTINUOUS_DELIVERY_NOT_CONFIGURED with this message:

Environment <ID> has no continuous delivery, so it cannot be rolled back.

Where can I get more help with ERR_NGROK_SHIP_ENVIRONMENT_CONTINUOUS_DELIVERY_NOT_CONFIGURED?

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