Microsoft Loop Page embedded in SharePoint - Infinite Spinner

Question

Microsoft Loop Page embedded in SharePoint - Infinite Spinner

T, A 0

A previously working loop page, embedded into a SharePoint site, is now failing to load when accessed through the embedded web part. I used a sharing link and an iframe to embed the page to previous success. Now, I get an authentication pop-up, which seems to work (I see my workspaces and loop ui), but no loop component itself will ever load. Instead, I get this infinite spinner. Are there any potential fixes and/or updates recently that might have caused this? InfiniteSPinner

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Answer 1

Hi @T, A,

Thanks for your report. I’ve checked the resources available to me, but I’m not currently seeing any known issues or widespread reports that match the behavior you described.

As a first step, I recommend performing some basic troubleshooting:

Confirm the Loop page opens normally when accessed directly through its sharing link outside of SharePoint.
Test the SharePoint page in an InPrivate/Incognito window and in a different browser.
Verify that the sharing link is still valid and that affected users still have access to the underlying Loop page. Loop page sharing relies on the page link and workspace permissions.
If the page is embedded using a SharePoint Embed web part and iframe, try recreating the embed with a newly generated Loop sharing link.
Check the browser Developer Tools (F12) for authentication errors, blocked third-party cookies, CSP errors, or iframe-related blocking messages.

If the issue continues after these checks, I recommend contacting Microsoft Technical Support for further investigation, as they can review service-side logs and environment-specific details that are not available through public troubleshooting resources.

For business support:

Find your Microsoft 365 admin: If you don't know who the global admin is in your organization, you can find guidance here: How can I find my Microsoft 365 admin? - Microsoft Support
Submit a service request: The Global Administrator should create a support request with Microsoft to receive advanced technical assistance. For detailed instructions, see: Get support - Microsoft 365 admin | Microsoft Learn

If your subscription is from a partner or reseller, contact the reseller's support provider to help open a service request on behalf of you instead.

If you discover any solutions or have additional insights, please consider replying to this thread to help others in the community.

I sincerely apologize for redirecting you to the Microsoft Technical Support Team. While I strive to assist as much as possible here in the forum, my resources are limited when it comes to backend-level diagnostics and advanced troubleshooting.

Thank you, and please let me know if you need any further assistance.

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T, A 0 Reputation points

2026-07-22T13:57:43.9933333+00:00

I have done the following

Confirm the Loop page opens normally when accessed directly through its sharing link outside of SharePoint. - This works

Test the SharePoint page in an InPrivate/Incognito window and in a different browser. - Has the same issue on private windows and different browsers

Verify that the sharing link is still valid and that affected users still have access to the underlying Loop page. Loop page sharing relies on the page link and workspace permissions. - The link is still valid

If the page is embedded using a SharePoint Embed web part and iframe, try recreating the embed with a newly generated Loop sharing link. - The error still persists

For the final bullet, I can see the following error in dev tools - THIS OCCURS BEFORE THE AUTHENTICATION POP-UP, BUT ONLY ONCE THE EMBEDDED PAGE INITIALLY LOADS

boot.f3ea97f8d291bdb1-1.js:1 This document requires 'TrustedHTML' assignment. The action has been blocked.

When I get to this infinite spinner, I see the authentication pop-up continually show up every minute or two if I stay on the sharepoint page with the embedded loop component. Let me know if this gives more information or clues towards what I might be able to do to resolve this.
Tamara-Hu 18,035 Reputation points Microsoft External Staff Moderator

2026-07-22T14:05:54.6266667+00:00

Thanks for your additional details.

Since the Loop page opens successfully when accessed directly, the sharing link is valid, and the issue persists across browsers, InPrivate sessions, and newly generated embed links, this does not appear to be a permissions or browser cache issue.

The console error: "This document requires 'TrustedHTML' assignment. The action has been blocked." suggests that a security policy is preventing part of the embedded Loop content from rendering inside the iframe. Based on the testing performed so far, the problem appears to be specific to the SharePoint embedded experience rather than the Loop page itself.

At this point, I would recommend opening a Microsoft Support case for more in-depth troubleshooting, as I don't have access to the advanced diagnostic tools and logs needed to investigate this further.

When contacting Microsoft Support, please provide the following information:

The exact browser console error message

A screenshot of the infinite spinner

The SharePoint page URL

Confirmation that the Loop page loads correctly outside the iframe

Confirmation that the issue occurs across multiple browsers and InPrivate sessions

These details should help the support team determine whether this is a product issue or an intentional change in how embedded Loop content is handled within SharePoint.

Thank you for taking your time so far and I hope your issue will be resolved soon.