I have never seen this before. You use the same setup like I have here: https://www.tinywebgallery.com/blog/advanced-iframe/advanced-iframe-pro-demo/external-workaround-auto-height-and-css-modifications
And there is also the height sent by the iframe.html
It seems that somehow edge has a false positive here. You can tell microsoft that this is o.k. Have you already reported this as safe as website owner?
Please also check your config. If I press F12 I see:
ai.min.js?ver=814744:2 Advanced iframe configuration error: You have enabled the resize of the iframe for pages on the same domain. But you use an iframe page on a different domain. You need to use the external workaround like described in the settings. Also check the next log. There the browser message for this error is displayed.
You need to disable auto height in the short code as you use the external workaround.
Can you also please contact me by e-mail? https://www.tinywebgallery.com/en/about.php to find a solution for you?
Best regards, Michael