Why Web Viewer 2.0 Blocks Some Links

You reached this page because Web Viewer could not show a link inside PowerPoint or Excel. The link may still work in a normal browser tab.

This usually happens when the website sends a browser security rule that says: do not show this page inside another app.

If you do not control the website

If another company, bank, dashboard vendor, school system, or software product owns the page, you usually cannot fix it yourself. The website owner has to decide whether they allow their page to appear inside apps like Web Viewer.

If you control the website

Start by checking whether the page sends either of these headers:

Content-Security-Policy: frame-ancestors 'self';

X-Frame-Options: SAMEORIGIN

Those settings tell browsers not to show the page inside Web Viewer, even when the URL opens in a normal browser tab.

Possible fixes

Remove the blocking headers. This is the simplest option when the page should load in Web Viewer and you do not need to restrict where it appears.

Allow Web Viewer in frame-ancestors. If you want to limit which sites can show the page, include https://1990quebec.com:

Content-Security-Policy: frame-ancestors 'self' https://1990quebec.com;

If your policy already includes Microsoft domains, add Web Viewer to the same list.

Close but incomplete:

Content-Security-Policy: frame-ancestors 'self' https://*.office.com https://*.microsoft365.com;

Works with Web Viewer:

Content-Security-Policy: frame-ancestors 'self' https://*.office.com https://*.microsoft365.com https://1990quebec.com;

Other settings that can block a page

Older sites may use X-Frame-Options. If a page sends X-Frame-Options: DENY or X-Frame-Options: SAMEORIGIN, browsers will not allow Web Viewer to display it.

Web Viewer also requires HTTPS. If a URL redirects to an HTTP page, Web Viewer blocks it.

Quick checklist

• Use an HTTPS URL.
• Remove blocking headers from pages that should load in Web Viewer.
• Do not send X-Frame-Options: DENY or SAMEORIGIN.
• If you use frame-ancestors, include https://1990quebec.com.
• After changing headers, reload the page in Web Viewer and try again.

Need help?

Still stuck? Contact Web Viewer support with the URL, and we can help identify the blocking header.