ERR_NGROK_SHIP_APP_ENVIRONMENTS_OR_PR_PREVIEWS_REQUIRED: The request must include at least one environment or 'pr_previews' - ngrok documentation

What does ERR_NGROK_SHIP_APP_ENVIRONMENTS_OR_PR_PREVIEWS_REQUIRED mean?

ngrok returns ERR_NGROK_SHIP_APP_ENVIRONMENTS_OR_PR_PREVIEWS_REQUIRED with this message:

The request must include at least one environment or 'pr_previews'.

Where can I get more help with ERR_NGROK_SHIP_APP_ENVIRONMENTS_OR_PR_PREVIEWS_REQUIRED?

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