ERR_NGROK_SHIP_CONTAINER_IMAGE_NOT_FOUND: Image IMAGE was not found at HOST, or the credential cannot see it - ngrok documentation

What does ERR_NGROK_SHIP_CONTAINER_IMAGE_NOT_FOUND mean?

ngrok returns ERR_NGROK_SHIP_CONTAINER_IMAGE_NOT_FOUND with this message:

Image <IMAGE> was not found at <HOST>, or the credential cannot see it.

Where can I get more help with ERR_NGROK_SHIP_CONTAINER_IMAGE_NOT_FOUND?

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