ERR_NGROK_SHIP_CONTAINER_IMAGE_PULL_DENIED: Registry HOST rejected the pull credential for IMAGE (HTTP STATUS) - ngrok documentation

What does ERR_NGROK_SHIP_CONTAINER_IMAGE_PULL_DENIED mean?

ngrok returns ERR_NGROK_SHIP_CONTAINER_IMAGE_PULL_DENIED with this message:

Registry <HOST> rejected the pull credential for <IMAGE> (HTTP <STATUS>).

Where can I get more help with ERR_NGROK_SHIP_CONTAINER_IMAGE_PULL_DENIED?

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