ShowSendDialogAsync not working

[MouradMessiha]

FBSession.ShowSendDialogAsync used to work, recently i noticed it stopped working.
The popup dialog now shows a facebook page showing the error: "Sorry, this content isn't available right now".

Code:

		FBSession fbSession = FBSession.ActiveSession;
                fbSession.FBAppId = "...";
                fbSession.WinAppId = "...";
                FBPermissions permissions = new FBPermissions(new List<String> { "email" });
                if ((await fbSession.LoginAsync(permissions)).Succeeded) 
                {
                    PropertySet parameters = new PropertySet
                        {
                            { "link", MicrosoftStoreUrl }
                        };
                    FBResult result = await fbSession.ShowSendDialogAsync(parameters);
                }