Hi - I have created a public survey that is "private"; I want to email some of my users so they can respond to the survey on their smart phones and tablets and don't want them to have the hassle of logging in.

However, as soon as I set the survey to private and provide the global survey URL my website asks for a login.

Survey is public, permissions are set so public can respond to the survey; the category is public

I am stuck! Can you help?