We can embed Google Slides to a blog, but not to a group page.
When you embed a Google Slide to a group page, at first it seems to work fine (in preview mode).
But after you finish inserting the embed codes and click 'Create New Group Page' or 'Update' button, it will disappear.
Please give us advice.
updated by @semi-palar: 22 Feb 2022 02:08:07AM