while trying to deploy a service on a private node, from my hub repository, I receive a "oops! the requested resource was not found (404). this is true because the default tag to be chosen is latest, and I do not have a latest tag for this repo. for the other one, I do have a latest tag, and that seems possible to deploy.
if you ask me, the default tag field should be empty, allowing you to select, in reverse date/version order, from latest to first, the tag that you need.