ERR_NGROK_SHIP_CONTAINER_IMAGE_REGISTRY_UNAVAILABLE: Registry HOST did not answer for IMAGE: REASON - ngrok documentation

What does ERR_NGROK_SHIP_CONTAINER_IMAGE_REGISTRY_UNAVAILABLE mean?

ngrok returns ERR_NGROK_SHIP_CONTAINER_IMAGE_REGISTRY_UNAVAILABLE with this message:

Registry <HOST> did not answer for <IMAGE>: <REASON>

Where can I get more help with ERR_NGROK_SHIP_CONTAINER_IMAGE_REGISTRY_UNAVAILABLE?

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