Currently we need to open the Qlik hub first then use embedded iFrame on Chrome in IPAD else iFrame doesn't load the dashboard(Safari browser no issue).
As per below article ,Crome is not supported in IPAD
NOTE: Upon clicking this link 2 tabs may open - please feel free to close the one with a login page. If you only see 1 tab with the login page, please try clicking this link first: Authenticate me! then try the link above again. Ensure pop-up blocker is off.