This error occurs after you install an application and the protocols used for synchronization are not set to Outlook. Follow the troubleshooting steps below in the order provided to fix this issue.

Reset protocols to point to Outlook

  1. In Windows, click Start > Settings > Apps, and then select Default apps on the left-hand side.

  2. Select Set defaults by app.

  3. Find Outlook in the list of applications, click it, and select Manage.

  4. Check each file type to make sure they are associated with Outlook. If you find one that isn't, click to the right of the file type and select Outlook from the list.

  5. Close the window and then run a repair of Office. The steps to access the repair tool vary depending on your operating system. Choose from the drop-down list below.

  6. After the repair is done and you've restarted your PC, open iCloud and check if it can sync without a problem.

Uninstall previous versions of Office

You may have an older version of Office still installed on your PC that's causing this error. To check, open the Control Panel, select Programs and Features, and scan the list for any other version of Office that may be installed. If you come across an older version, select it and click Uninstall. Restart your computer and check if this fixed the problem.

Uninstall the Office installation from the Microsoft Store app

If Office was pre-installed on your PC or was installed from the Microsoft Store it may not work with iCloud. You'll need to uninstall Office and then reinstall it to fix the problem. To do this:

  1. Select Start The Windows 10 Start icon > Settings Settings button on Windows 10 Start menu > Apps.

  2. Under Apps & Features select Microsoft Office Desktop Apps. If you don't find that name, scan the list for any other version of Office that may be installed and select it.

  3. Select Uninstall.

Restart your computer and then follow the steps in Download and install or reinstall Office 365 or Office 2019 on a PC or Mac to reinstall Office.

Run PowerShell commands

You can run these PowerShell commands on your PC to reconfigure the application. Before you take these steps, remember your sign in credentials to Outlook as you may be prompted to sign back in. Also, you'll need administrator privileges. After running these commands, you'll have to repair Office.

  1. Click Start and type powershell in the search bar.

  2. Right-click the Windows PowerShell app icon and select Run as Administrator.

  3. Once you're in PowerShell, type the following commands:

    Get-AppxProvisionedPackage -Online | where-object {$_.packagename –like “*Outlook*”} | Remove-AppxProvisionedPackage –Online

    Get-AppxPackage “*Outlook*” | Remove-AppxPackage

  4. Close the PowerShell app and then restart it without selecting Run as Administrator.

  5. Restart your PC.

  6. Repair Office. The steps to access the repair tool vary depending on your operating system. Choose from the drop-down list below.

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