Pepper Robot Tablet: Cannot show the specific webpage on Pepper Tablet

I came across an issue is I noticed not all website link can be shown on the Pepper Tablet, is that right? for example, I want to show this link: "https://ift.tt/3x3gL2A" which I developed for users to register, but on the tablet, it is always white screen. Can anyone explain it? how can I show above link on Pepper Tablet?

Thanks in advance.

this website is I developed for my research, I have been used for at least 6 months, I am hopeing I can use on Pepper robot directly.