ERR_NGROK_SHIP_APP_ENVIRONMENT_NAME_DUPLICATED: Environment name NAME is used more than once in 'environments' - ngrok documentation

What does ERR_NGROK_SHIP_APP_ENVIRONMENT_NAME_DUPLICATED mean?

ngrok returns ERR_NGROK_SHIP_APP_ENVIRONMENT_NAME_DUPLICATED with this message:

Environment name <NAME> is used more than once in 'environments'.

Where can I get more help with ERR_NGROK_SHIP_APP_ENVIRONMENT_NAME_DUPLICATED?

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