Sharepoint Embedded Paginated Report "Sign In" button does not work

When you embed a Paginated Report into SharePoint Online (e.g., via iframe or Power BI web part), the authentication to Power BI Service must complete within the same browser context (iframe + session + token chain).
What you're seeing is:

• Clicking "Sign in" inside the embedded report triggers a popup-based login (modern auth).
• The popup authenticates the user and closes, but:
• The parent page fails to detect that authentication completed, due to:
• Blocked third-party cookies, or
• SameSite cookie restrictions, or
• Cross-origin iframe sandboxing, or
• Recent Microsoft identity flow update (April–May 2025 updates hardened this).
• Result: The iframe can’t reuse the token, and reloading doesn't help.

Recommended Fixes

1. Enable Third-Party Cookies: Edge and Chrome have started enforcing third-party cookie restrictions that block Power BI iframe auth tokens.

In Edge:

• Go to edge://settings/content/cookies
• Allow all cookies
• Or, add an exception for https://app.powerbi.com and your SharePoint domain

1. Add Trusted Sites in Edge

Ensure both Power BI and SharePoint domains are in trusted sites:

• Open Internet Options > Security > Trusted Sites > Sites
• Add:
• https://*.powerbi.com
• https://*.microsoftonline.com
• https://*.sharepoint.com

This helps the Microsoft Identity Platform maintain session integrity across domains.

1. Enable "Allow Authentication Context" in SharePoint Embed

If embedding via iframe manually (i.e., not Power BI web part), ensure:

<iframe
  src="https://app.powerbi.com/reportEmbed?reportId=...&..."
  sandbox="allow-scripts allow-same-origin allow-forms allow-popups allow-popups-to-escape-sandbox"
  allow="fullscreen"
></iframe>

Please mark this post as a solution if it helps you. Appreciate Kudos.

Hi keith_smith1 ,

The problem you are experiencing with the “Sign In” button not working in Power BI Paginated reports embedded in SharePoint has been reported by some users recently. You can try the following solutions:

1. Browser and Session Issues
If this problem occurs in the Microsoft Edge browser, first try clearing cookies and site data.
Blocking third-party cookies can interfere with the login process. Try disabling this feature in the browser settings.
Alternatively, test in a different browser such as Google Chrome or Firefox.

2. Power BI and SharePoint Session Incompatibility
Make sure that users are logged in to SharePoint and Power BI with the same account.
After clicking the “Sign In” button and logging in to a new tab, the SharePoint page should be refreshed manually. Automatic redirection sometimes does not work.

3. Update the Embed Code
The method used to create the embed code may have changed. Try to regenerate the embed code via Power BI Service and add it to the SharePoint page again.
Especially if a different method such as “Publish to web” is used instead of the “Secure Embed” method, such problems may occur.

4. Temporary Problem on Microsoft Side
Such issues can sometimes be caused by updates made by Microsoft. Check the Microsoft 365 Service Health Dashboard to see if there is an outage or issue.

Hi keith_smith1,

Thanks for confirming that you have raised a support ticket for this issue. kindly let us know if there is any update on this ticket from support team. If, yes can you please post your steps below and accept it as answer this will help other commmunity members find answers for similar issues quickly.

Thanks,

Prashanth Are