Iframe imbed no longer working?

An embed to a Figma prototype has unexpectedly stopped loading/working. Originally it just landed on the first frame but didn’t allow the user to click on any of the hotspots in the Figma prototype. I tried making some changes to the code and now it no longer even loads the frame.

I had read elsewhere on the forums that some imbed problems could be related to the subdomain of the imbed source link.

I have no problem validating the code using this tool, where the prototype in question loads through the iframe with full interactivity: HTML And Script Code Tester

My HTML is:

Any help would be greatly appreciated!


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