Read this first: the three things that fix most embeds

Nine out of ten embed problems are one of these.

• The page is not shared. A widget embed in a private Notion page works for you and nobody else. Share the page first.
• You pasted the wrong link. Use the embed link from the dashboard, not the address bar of the editor.
• The block is too small. Notion embeds do not resize themselves. Drag the bottom edge until the widget fits.

If none of those is it, post a screenshot and the widget link and I will look.