Does wordpress not allow <iframe>?

I got a html5 game I want to upload on WordPress, the code is:

<iframe src=”https://html5.blablabla.co/6zy3ezihx8y0dx10u8i383kt8b4da7wm/” width=”1280″ height=”720″ scrolling=”none” frameborder=”0″></iframe>

I tried adding it with custom HTML block it works when I hit preview on the block, but when I hit save, go to my website – it’s not there. just empty page.

At first I thought there might be smth wrong in general, but when I add idk text block “blablabla” – hit save and it shows normally on the website.

What am I doing wrong?

 

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