SharePoint Document Issues

Fix Microsoft Bookings Page Appearing Blank Embedded in SharePoint

Maira Mehtab Sep 21, 2026 869 views

Question details

The user is attempting to embed a Microsoft Bookings shared page into a SharePoint Online site using the Embed web part, but the page remains completely blank.

Product: Microsoft SharePoint Online
Device & OS: not provided
Scenario: Embedding a Bookings page via iframe or the Embed web part into a SharePoint site for internal team or external public access.
Observed behavior: The embedded web part fails to load and remains blank. The browser developer console displays ERR_BLOCKED_BY_RESPONSE and errors indicating that login.microsoftonline.com refused the connection.

Before you start

Ensure you have site administrator permissions for your SharePoint Online site and verify that you can access the Microsoft 365 Admin Center in case you need to escalate the issue for backend support.

Solution 1Recommended

Perform Basic Browser and Network Isolation Tests

Run isolation tests to rule out local caching, browser extensions, or network restrictions that might be blocking the iframe connection.

Before escalating to Microsoft Support, it is crucial to confirm that the issue is not caused by a localized browser setting, caching issue, or network firewall blocking the Embed web part.

Test in a private browsing window

Open your SharePoint site in an Incognito (Chrome) or InPrivate (Edge) browser window to bypass localized cache and extensions.

Switch network connections

Connect to a different internet network (such as a mobile hotspot) to ensure your current ISP or corporate firewall isn't blocking Microsoft authentication endpoints.

Test an alternative Bookings page

Create or obtain a link to a completely different Microsoft Bookings page and attempt to embed it in the affected SharePoint site to check if the issue is page-specific.

Test on a different SharePoint site

Navigate to a different SharePoint team or communication site and try adding the Embed web part there. This determines if the original site's permissions or settings are corrupted.

Solution 2

Contact Microsoft 365 Support for Authentication Errors

If isolation tests fail and console errors persist, the issue is likely tied to Microsoft's iframe authentication policies requiring backend diagnostics.

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Frequently Asked Questions

Why does SharePoint block the Microsoft Bookings iframe?

This usually happens due to cross-origin resource sharing (CORS) policies or authentication token mismatches. Security measures prevent login.microsoftonline.com from connecting inside an iframe to protect against clickjacking attacks.

How do I capture HAR logs for Microsoft Support?

Open your browser's Developer Tools (F12), go to the Network tab, and check the 'Preserve log' box. Reproduce the blank page issue by refreshing the SharePoint page, then right-click anywhere in the network grid and select 'Save all as HAR with content'.

Can I share a Bookings page on SharePoint without embedding it?

Yes. As a reliable workaround, you can add a standard 'Quick Links' or 'Button' web part in SharePoint that directs users to the standalone Microsoft Bookings URL in a new tab, bypassing the need for an iframe entirely.

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