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Fix Microsoft Lists Showing @mention{0} Instead of User Mentions

Kushani Nimanthika Oct 9, 2026 869 views

Question details

Users need a way to resolve an error in Microsoft Lists where tagging a team member in a comment fails and displays a raw code placeholder.

How to Fix Microsoft Lists Showing @mention{0} Error

Product: Microsoft Lists
Device & OS: not provided
Scenario: Collaborating and leaving comments for team members on items within Microsoft Lists.
Observed behavior: Typing an @mention displays as '@mention{0}' instead of resolving to the user's name, preventing the selected person from receiving an email notification.

Before you start

Ensure you have a stable internet connection and that the users you are attempting to tag have proper access permissions to the specific Microsoft List.

Solution 1Recommended

Test the List in an InPrivate or Incognito Window

Use a private browsing window to determine if the issue is caused by corrupted browser cache, outdated cookies, or conflicting browser extensions.

Browser caching issues or third-party extensions (like ad blockers) can sometimes block the scripts required to render user profiles and mentions correctly.

Open a Private Window

Launch your web browser and open a new InPrivate window (Microsoft Edge) or Incognito window (Google Chrome).

Sign in to Microsoft 365

Navigate to the Microsoft 365 portal and log in with your organizational credentials.

Test the @mention Feature

Open Microsoft Lists, navigate to the affected list, and attempt to use the @mention feature in a comment to see if it resolves correctly.

Test the List in an InPrivate or Incognito Window

Clear Browser Cache: If the mention works perfectly in an Incognito window, clearing your browser's cache and cookies or disabling extensions will likely fix the issue permanently.

Solution 2

Collect HAR Logs and Open a Support Ticket

If the issue persists across multiple users and lists, it requires investigation by Microsoft's development team using network logs.

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Frequently Asked Questions

Why does the @mention fail in some Microsoft Lists but work in others?

This discrepancy is usually caused by list-specific permission settings, corrupted list views, or localized caching issues. Testing with different lists helps isolate whether the problem is account-wide or isolated to a single list.

What are HAR logs and why does Microsoft support need them?

HAR (HTTP Archive) logs securely record the interaction between your web browser and the website's server. Microsoft support uses them to identify backend errors or network requests that fail when the @mention{0} bug occurs.

Can standard non-admin users submit a support ticket for Microsoft Lists?

Generally, standard users cannot submit service requests directly to Microsoft. You must contact your organization's IT administrator, who has the required permissions to open and manage a ticket in the Microsoft 365 admin center.

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