Problem inserting youtube HTML into InDesign document

[joshm92720789]

I'm trying to insert this YouTube embed code: 

<iframe width="560" height="315" src="https://www.youtube.com/embed/1AVmPKcSUEg" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>

Into my indesign document, which will then be published online, however it just comes up with a small box with "This is an HTML snippet." in bold type. I've done it before with YT code and it's worked fine. Object>Insert HTML copy code, hit okay. 

I've quit the programme, reset preferences and tried again in a blank document, but still the same error is happening.