Repository forking requests for credentials even though HUB_CONFIG is set

[prashantabkari]

At the stage "Setup the GitHub Repositories" and below step

for repo in ${REPOS[@]}; do hub clone "https://github.com/kelseyhightower/${repo}.git" cd ${repo}/ hub fork cd - rm -rf ${repo} done

hub fork requests for username credentials even though the hub configuration file is created and set in HUB_CONFIG env
It shouldn't since username and the tokens are already available ?