Adding a Google Maps Using iframe with Custom HTML Code Block from WordPress.org Not Working

Hello, I was wondering to get an explanation on why this custom HTML block from WordPress.org is not working correctly. I wanted to add Google Maps to my WordPress website. I followed the WordPress.org guide on adding Google Maps in which you just paste the iframe HTML into the custom HTML block to add Google Maps to your website. For some reason when I save the page for my website, the Google Maps don't show up in the physical website and when I try to edit the page again, the block just disappears. I was wondering about the reason why the block would disappear. I thought it might be due to the page currently being private but wasn't completely sure. Do I need to configure something to allow Google Maps to show up on my website?