Save your presentation to OneDrive.com. (Storing the presentation to a public folder online is what allows you to embed it on a web page.)
To retrieve an Embed link, Microsoft requires you to have a Microsoft 365 account.
Retrieving the embed link isn't available from the PC or Mac versions of PowerPoint.
2. Open your presentation in PowerPoint for the web. On the File tab of the Ribbon, click Share, and then click Embed.
3. To create the HTML code to embed your file in the web page, click Generate.
4. In the Embed box, under Dimensions, select the correct dimensions for the page.
5. Under Embed Code, right-click the code, click Copy, and then click Close.
Steps for EthosCE:
6. Navigate to the page where this powerpoint needs to be embedded.
7. Click "Source" within the WYSIWYG editor.
8. Paste the copied embedded code.
9. Click Save.