ERR_NGROK_SHIP_CONTAINER_IMAGE_REGISTRY_ADDRESS_NOT_ALLOWED: Registry HOST resolves to a private or reserved address - ngrok documentation

What does ERR_NGROK_SHIP_CONTAINER_IMAGE_REGISTRY_ADDRESS_NOT_ALLOWED mean?

ngrok returns ERR_NGROK_SHIP_CONTAINER_IMAGE_REGISTRY_ADDRESS_NOT_ALLOWED with this message:

Registry <HOST> resolves to a private or reserved address. ngrok cannot pull from it.

Where can I get more help with ERR_NGROK_SHIP_CONTAINER_IMAGE_REGISTRY_ADDRESS_NOT_ALLOWED?

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