I can't figure out what's causing it, but I've been able to embed a youtube video iframe, but for some reason, the CodeSandbox iframe keeps causing a build error and it won't work. Are there some limitations to iframe embeds I need to watch out for that I may be able to fix?
So after messing around with the different attributes it seems having a Style tag on the iframe is what's causing it to fail the build for some reason, removing the style tag allows it to build and the iframe embeds work well now.