Iframe embed issues

I'm trying to embed with a public link/app the iframe embed code retool shares.

I'm trying to embed this in a squarespace page, but when i save there, the iframe basically disappears and doesn't save. This is what I got back from squarespace:

This is a security feature. The iFrame content has X-Frame-Options set to 'sameorigin'. You'll want to check the settings on that third party service (not Squarespace).

Is there any way to get around this on the retool side?

I've tried to embed this now using iframe in about 5 different sites including wordpress, but nothing actually renders the actual retool app. Yes, I have it set to public. Is this embed actually possible on platforms that people use?