Hey!
We embedded some sheets via iframe. You can do it by setting a ticket of your current user in URL
For instance, https://qliksrv.domain.com/hdr/app/AppIdXXX/sheet/SheetIdXXX?QlikTicket=XXXXXXXXXX
May be steps we applied will be helpfull for you
1. Create header Authentication with method "Ticket", for example, name it hdr
2. In your webApp, create some global function to get ticket for current user
3. when user opens link of dashboards, call function of step 2 and put a new ticket to URL as in example above. Notice: new ticket lives not long time, so you have to apply ticket when opening it and after that session will be activated
