embed codes are no longer working from office 365 content

Hi Mark,

You're not alone in this concern, since there have been several similar reports from other users that previously working Office/OneDrive embed codes now display a blank frame, including in different browsers, private browsing sessions, and newly generated embed codes. You can take a look at these threads to see whether you experience the same behavior as they do:

• OneDrive personal – PowerPoint “Embed” iframes now show blank on external sites (Google Sites, local HTML) - Microsoft Q&A
• onedrive iframe-code is not working - Microsoft Q&A

I have checked the Microsoft 365 Service Health dashboard and also other support platforms, but as of now Microsoft has not yet publicly confirmed whether this is a deliberate platform change or a service regression.

Therefore, the best next step I would recommend is to reach out to your company's IT department and ask them to create a support ticket directly with Microsoft through the Microsoft 365 admin center by navigating to Support > Help & Support for further investigation. 

This route ensures you can contact a Microsoft technical support engineer who can perform a remote session to investigate the situation, verify the backend configurations, and run any necessary synchronization tools to resolve the problem. If the issue requires further attention, he/she can escalate it to a specialized team for deeper analysis.

• For guidance on how to request support in the admin center, please share this link with your IT admin: Get support - Microsoft 365 admin. 
• If you are unsure who your IT administrator is, you can refer to this official Microsoft guide for assistance: How do I find my Microsoft 365 admin? - Microsoft Support.

I hope this points you in the right direction. If you have any questions, feel free to leave a comment. I'll be happy to assist you further.

Thank you for your cooperation and understanding.

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