Webpage won't insert as web object in slide?

Hi,

I'm trying to add a web page previous to my course, so that the learners are contained within the course (IT literacy isn't always high).

I'm adding a web object, adding the URL, testing the link and Storyline says "The web address you entered cannot be displayed in a frame. In order to function properly, this web object must be set to open in a new browser window".

Why?? I can't figure it out?! The URL is https://www.cancercouncil.com.au/cancer-prevention/smoking/tackling-tobacco/resources/

Thanks in advance!