Anonymous User Access to SharePoint
In addition to having to follow the standard process to enable web application's anonymous access: I had to do a few PowerShell commands to make anonymous access perform most activities on SharePoint without limitation. 1) Modify the root webs anonymous permission mask (you can reduce the access here too) web . AnonymousPermMask64 = "FullMask" 2) Allow client calls for anonymous users $webApp = Get-SPWebApplication http://forms.turnkey.global $webApp.ClientCallableSettings.AnonymousRestrictedTypes.Remove( [Microsoft.SharePoint.SPList],"GetItems") $webApp.Update() 3) I also had to enable iframes for other sites to point to my SharePoint forms http://sadomovalex.blogspot.com.au/2015/12/remove-x-frame-options-sameorigin-http.html