Embedding iFrame from a Non-Public Web Page

Is it possible to embed iFrame code in Rise360 from a non-public web page? I have attached a screenshot of the code I am using and the output through an iFrame editor (with some date redacted). I am trying to embed a dashboard from the company Tableau server into company training materials housed in Rise360 (so all individuals using this report would have access to the Tableau server). 

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