Office Settings & Configuration

How to Fix Excel Web @Mentions and Comment Assignment Not Working

Bushra Parveen Oct 10, 2026 869 views

Question details

The user is unable to use @mentions or assign comment tasks to other users while working in Excel for the Web.

How to Fix Excel Web @Mentions and Comment Assignment Not Working

Product: Excel for the Web
Device & OS: not provided
Scenario: Collaborating on workbooks using comments and task assignments in a web browser environment.
Observed behavior: Excel for the Web fails to auto-complete @mentions, does not show the option to assign comment tasks, or fails to notify users when tagged.

Before you start

Ensure you have a stable internet connection and verify that your Excel workbook is saved in an organization-supported cloud location, such as OneDrive for Business or SharePoint.

Solution 1Recommended

Verify Your Microsoft 365 Account Type and License

Comment mentions and task assignments in Excel for the Web are fully supported only in specific enterprise environments.

Microsoft limits certain collaborative features, including task assignment in comments, to enterprise or work/school accounts. If you are using a personal Microsoft account, these features may not be available.

Check your logged-in account

Look at the top right corner of Excel for the Web to confirm you are logged in with your work or school credentials rather than a personal account.

Verify file storage location

Ensure the workbook you are editing is saved within your organization's SharePoint or OneDrive for Business directory, as local or personal cloud files do not support this feature.

Verify Your Microsoft 365 Account Type and License

Feature Rollout: Microsoft rolls out updates gradually. Even with the correct license, the feature might still be rolling out to your specific tenant.

Solution 2

Troubleshoot Browser and Network Issues

Corrupted browser cache or conflicting extensions can prevent Excel web scripts from loading the @mention interface properly.

Solution 3

Contact Your Microsoft 365 Administrator

If the features are still unavailable, the issue might stem from tenant-level configurations that require IT admin intervention.

Free Microsoft Office alternative

Try WPS Office for Seamless Team Collaboration

If Microsoft 365 tenant restrictions or licensing costs are slowing down your workflow, WPS Office offers a free, lightweight alternative with excellent file compatibility, an intuitive interface, and built-in cloud collaboration features.

1. Download the software: Visit the official WPS Office website and download the free installation package for your operating system.
2. Install WPS Office: Run the installer and follow the simple on-screen instructions to set up the suite on your device.
3. Open your spreadsheets: Launch WPS Spreadsheet and seamlessly open your existing Excel workbooks to start collaborating.

Free to use with a fast, lightweight installation processFully compatible with Microsoft Excel (.xlsx, .xls) filesBuilt-in cloud collaboration and advanced commenting featuresFamiliar user interface requires no learning curve to migrate

microsoft office alternative - wps office

Frequently Asked Questions

Why can't I tag someone in an Excel for the Web comment?

This usually happens because you are using a personal Microsoft account, the file is not saved in an organizational cloud location (like SharePoint), or your enterprise tenant administrator has restricted the feature.

Does Excel for the Web support task assignments for personal accounts?

Generally, no. According to Microsoft's documentation, comment task assignments and @mentions are heavily tailored for enterprise users with work or school accounts.

How do I correctly assign a task in Excel comments?

When the feature is enabled, right-click a cell, select 'New Comment', type '@' followed by your colleague's name, check the 'Assign to' box that appears, and click the send button.

Why do @mentions work in the desktop app but not in Excel for the Web?

Web browsers can experience script blocking, cache corruption, or network-level restrictions that don't affect the desktop application. Trying a private browsing window can help determine if it's a browser-specific issue.

Office App Problems