Comment 6 for bug 1095563

We investigated the issue to be caused by the fact that https://launchpad.net/~linaro-juice is a private launchpad team. Private teams are not exported for integration outside of Launchpad (in particular, it's not possible to verify if given user is a member of private teams).

So, the solution would be to change team to public. Unfortnately, Launchpad doesn't allow turning private team into public, so consider deleting and recreating, if that's possible, or otherwise create a new group for further usage.