how to fix powerpoint issue?

Run the Microsoft 365 Sign-in troubleshooter first because the failure affects Microsoft 365 desktop-app authentication with a work or school account, rather than general internet access.^1^

1. Run the sign-in troubleshooter

1. Close PowerPoint, OneNote, and the other Microsoft 365 apps.
2. Open Start → Get Help.
3. Search for sign in to Microsoft Office.
4. Run the Microsoft 365 sign-in diagnostic and apply its recommended corrections.
5. Restart Windows, open PowerPoint, and sign in with the work or school account.

Work/school and personal Microsoft accounts are separate identities, even when they use similar email addresses, so select Work or school account if prompted.^2^

2. Check the Windows work-account connection

Open Settings → Accounts → Access work or school.

• If the account is absent: select Connect, enter the work or school account, and complete the prompts.
• If it is already listed: do not disconnect it without approval from the organization’s IT administrator. Its presence means the device is connected, and organizational access policies may require IT investigation.^3^

Then retry PowerPoint and OneNote.

3. Repair the Windows authentication component

If the troubleshooter finds nothing and the computer runs Windows 10 version 1703 or later with Microsoft 365 version 1807 or later, repair the Microsoft Entra Web Account Manager (WAM) plug-in used by work accounts:

1. Right-click Start and open Windows PowerShell (Admin) or Terminal (Admin).
2. Run:

if (-not (Get-AppxPackage Microsoft.AAD.BrokerPlugin)) {
    Add-AppxPackage -Register `
      "$env:windir\SystemApps\Microsoft.AAD.BrokerPlugin_cw5n1h2txyewy\Appxmanifest.xml" `
      -DisableDevelopmentMode -ForceApplicationShutdown
}
Get-AppxPackage Microsoft.AAD.BrokerPlugin

3. Confirm that package information is returned without an error.
4. Restart Windows and test PowerPoint again.

Microsoft documents this repair for Microsoft 365 authentication failures caused by missing WAM package information.^1^

4. If it fails only on the organization’s network

Temporarily test on another connection, such as a mobile hotspot. If sign-in works there, ask the network administrator to review the authentication proxy or firewall. Microsoft identifies authenticated proxies and restricted Microsoft 365 destinations over TCP/HTTPS ports 80 and 443 as possible causes of desktop-app sign-in failures.^4^

Also temporarily disconnect any VPN through Settings → Network & Internet → VPN, then test again. Re-enable it afterward if it is required by the organization.

5. Repair Microsoft 365 only if authentication repair does not help

An Office repair affects the complete suite, not only PowerPoint:

1. Right-click Start → Installed apps on Windows 11, or Apps and Features on Windows 10.
2. Find Microsoft 365, select … → Modify.
3. Choose Online Repair → Repair.
4. Restart the computer and sign in again.

Online Repair is more comprehensive than Quick Repair.^5^

If the issue remains, provide the organization’s IT administrator with the exact time of the attempt, the account domain, Windows version, Microsoft 365 version, and any correlation ID shown after expanding the error details. This allows them to check Microsoft Entra sign-in logs and Conditional Access requirements.

References

1. Fix authentication issues in Microsoft 365 apps when you try to connect to a Microsoft 365 service
2. What's the difference between a Microsoft account and a work or school account? | Microsoft Support
3. Troubleshoot Windows device access
4. How to troubleshoot non-browser apps that can't sign in to Microsoft 365, Azure, or Intune | Microsoft Support
5. [Windows 11](https://support.microsoft.com/office/lifecycle/repair-an-office-application)