How to fix Microsoft Teams showing duplicate or missing participants in meeting attendee lists

Summary

This guide helps you troubleshoot and resolve: How to fix Microsoft Teams showing duplicate or missing participants in meeting attendee lists. Follow the steps below to fix the issue.

Common Causes

Microsoft Teams occasionally displays incorrect attendee information during meetings, such as duplicate names, missing participants, or roster counts that don't match the actual number of people in the call. These issues are usually caused by cached data, sync delays between Teams and your directory, or local client glitches. The steps below will walk you through resolving the most common causes, starting with the quickest fixes first.

Quick Fix Steps

Before diving into detailed troubleshooting, try these steps in order. Most attendee list issues are resolved after the first two.

1. Sign out of Teams and sign back in.
2. Restart the Teams app completely (close it from the system tray or menu bar, not just the window).
3. Check your internet connection and rejoin the meeting.
4. If the issue persists, move on to the detailed instructions below.

Detailed Instructions

Sign Out and Back In

Signing out clears the local session and forces Teams to re-sync your meeting data from the server.

1. Click your profile picture in the top-right corner of Teams.
2. Select Sign out.
3. Close Teams completely.
4. Reopen Teams and sign in with your usual credentials.
5. Rejoin the meeting and check the attendee list.

Clear the Teams Desktop Client Cache

Corrupted local cache files are a common cause of duplicate or missing participants. Clearing the cache forces Teams to rebuild its data from scratch.

On Windows

1. Close Teams completely. Right-click the Teams icon in the system tray and select Quit.
2. Press Win + R, type %appdata%\Microsoft\Teams, and press Enter.
3. Delete the contents of the following folders:
   • Cache
   • blob_storage
   • databases
   • GPUCache
   • IndexedDB
   • Local Storage
   • tmp
4. Restart Teams and sign in.

On macOS

1. Quit Teams completely (Cmd + Q).
2. Open Finder and click Go in the menu bar.
3. Hold Option and click Library.
4. Navigate to Containers/com.microsoft.teams2 (or com.microsoft.teams on older versions).
5. Delete the contents of the Cache, Data, and tmp folders.
6. Restart Teams and sign in.

Update Teams to the Latest Version

Microsoft regularly releases fixes for known roster and sync issues. Running an outdated version can cause problems that have already been resolved.

1. Click the three dots (⋯) next to your profile picture.
2. Select Check for updates.
3. If an update is available, Teams will download and install it automatically.
4. Restart Teams when prompted.

Verify Your Directory Sync

Missing participants often occur when Teams has not fully synced with your organisation's directory (such as Microsoft Entra ID, formerly Azure Active Directory).

1. Open Teams and click your profile picture.
2. Select Settings then General.
3. Scroll down and confirm that the correct organisation is listed under your account.
4. If you manage your tenant, sign in to the Microsoft 365 admin centre and check the sync status under Users > Active users.
5. Wait 15–30 minutes for the sync to complete, then rejoin the meeting.

Test in the Teams Web App

Testing in the browser helps determine whether the issue is with your local client or with the Teams service itself.

1. Open teams.microsoft.com in a new browser window.
2. Sign in with the same account.
3. Join a test meeting and review the attendee list.

If the attendee list is correct in the web app but incorrect in the desktop app, the issue is local to your installation. If the problem appears in both, it is likely a server-side or tenant configuration issue.

Check for Known Service Issues

Sometimes Microsoft experiences service-side incidents that affect meeting rosters. Before troubleshooting further, check whether this is a wider outage.

1. Visit the Microsoft 365 Service Health Status page.
2. Look for any active incidents under Microsoft Teams.
3. If an incident is listed, you will need to wait for Microsoft to resolve it.

Troubleshooting

Duplicate Participants Still Appearing

If duplicates remain after clearing the cache:

• Ask the affected user to sign out, clear their cache, and sign back in.
• Check whether the user is signed in on multiple devices simultaneously (laptop, phone, desktop). Each active session can sometimes appear as a separate entry until the session fully registers.
• Disable any third-party Teams plugins or integrations that may be injecting roster data.

Participants Missing from the Roster

If specific users are not appearing in the attendee list:

• Confirm the user has actually joined the meeting (not just clicked the link).
• Ask the missing user to check their Activity status in Teams — if it shows Do not disturb or Appear offline, their presence may not sync immediately.
• Verify the user has not been removed from the meeting by an organiser.
• Check whether the meeting has reached its participant limit. Standard Teams meetings allow up to 1,000 participants.

Attendee Count Is Incorrect

The participant count can lag by a few seconds while Teams processes join and leave events. If the count remains wrong:

• Wait 60 seconds and refresh the roster by clicking People again.
• Leave and rejoin the meeting to force a fresh roster load.
• Try the meeting from a different device to rule out a client-specific issue.

If you have completed all the steps above and the attendee list is still incorrect, the issue may require investigation at the tenant or service level. Please open a ticket through our support portal and include the meeting ID, time of the meeting, and a screenshot of the incorrect attendee list so our team can assist you further.

Still Having Issues?