In such a case, my docker hub user name is 'junhan', and I am in an org callded 'teamA'.
Then, I should be able to use below setting to use iotedgedev push for both 'junhan'and 'teamA':
CONTAINER_REGISTRY_SERVER="https://index.docker.io/v1"
CONTAINER_REGISTRY_USERNAME="junhan"
CONTAINER_REGISTRY_PASSWORD="<junhan_pwd>"