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When I take a look at the developer console in Chrome when loading your page I see the following error -
Refused to display 'https://www.instagram.com/p/BE6ZUYUmJuQ/' in a frame because it set 'X-Frame-Options' to 'SAMEORIGIN'
Basically instagram is denying your request to display that page because the domain for public.tableau.com is different. It works on your desktop because the request from Desktop isn't considered to be a webpage like it is when you publish to Tableau Public / Tableau Server.