Unauthorized error while trying to pull from a private registry in OpenShift 3

Issue

While trying to import an image from an external registry (e.g: JFrog Artifactory) through oc import-image

oc import-image <image_name> --from <remote_image_url>

Import failed (Unauthorized): you may not have access to the Docker image "<remote_URL>"

even after defining the proper secret:

oc secrets new-dockercfg myapp --docker-server=artifactorypro.shared.myapp.com --docker-username=foo --docker-password=bar --docker-email=myemail@here.com

oc secrets add serviceaccount/default secrets/myapp --for=pull