Why have embedded Excel, PowerPoint, and Word iframes in third-party apps suddenly stopped working?

Hello,

I am writing to report a critical issue we are currently facing with Microsoft Office iFrames.

Until recently, we have successfully integrated Excel, PowerPoint, and Word iFrames within our applications. However, these iframes are now consistently getting stuck on the login page, preventing any further interaction or functionality.

This problem has significantly disrupted our normal operations and productivity, as these features were working seamlessly before.

To better understand the origin of the issue, I created a distinct HTML page solely for the purpose of testing these iframes. Here are a few more details that might help in diagnosing the issue:

• Date when the issue started: 2024-04-25.

• Browsers used: Chrome, Edge.

• Changes made before the issue: None.

• Network issues: The network tab shows 403 errors when attempting to load the iframe content.

• Direct URL test: Opening the iframe URL directly in a separate tab displays the content correctly, which suggests that the issue is specific to the iframe integration.

For your reference, I have attached a GIF that showcases the exact issue we are experiencing.

Could you please provide us with guidance on how to resolve this issue?

Are there any changes in iframe integration policies or authentication methods that we should be aware of?

Thank you for your prompt attention to this matter.