When you update an information barrier policy in Microsoft Teams, existing chats may still allow communication between segments that should be blocked. This happens because Teams caches policy assignments and applies them only at the next sign-in or after a specific refresh cycle. In this article, you will learn why the barrier does not take effect immediately and how to force Teams to apply the updated policy without waiting for the automatic refresh.
The fix involves clearing the Teams cache, signing out and back in, and verifying the policy assignment in the Teams admin center. You will also see how to handle persistent issues where the barrier still fails to block a chat after the main fix.
Key Takeaways: Forcing Teams to Apply a Changed Information Barrier Policy
- Teams admin center > Information barriers > Policy segments: Shows the current segment definitions and lets you verify that the updated policy is correctly assigned.
- Ctrl+Shift+Esc to open Task Manager: Ends all Teams background processes that may hold a stale policy cache.
- %appdata%\Microsoft\Teams cache folders: Deleting these folders forces Teams to re-download the latest policy on next launch.
- Sign out and sign back in: Resets the Teams client session and triggers a fresh policy assignment from the server.
Why Information Barriers Do Not Block Chats Immediately After a Policy Change
Information barriers in Teams are enforced by the Microsoft 365 compliance service. When an administrator creates or changes a barrier policy, the change is written to the Microsoft 365 backend. However, the Teams client does not receive the change in real time. Instead, the client checks for policy updates at sign-in and then periodically during the session.
The default refresh interval for information barrier policies is about 24 hours. This means that after you change a policy, users may continue to chat with people in blocked segments for up to a day. The Teams desktop app also caches policy data locally, so even if the server has the new policy, the client may keep using the old one until the cache is cleared.
Another factor is that information barriers apply to new conversations, not to existing ones. If a chat was started before the policy change, the barrier does not retroactively block that chat. You must start a new conversation to see the effect of the updated policy. This is a common source of confusion when testing the barrier after a change.
How Policy Assignment Works
Information barrier policies are assigned to users through policy segments. Each user belongs to one or more segments, and the barrier defines which segments cannot communicate with each other. The assignment is stored in Azure Active Directory and is replicated to the Teams service. The Teams client pulls this assignment during authentication and then refreshes it at intervals.
When you change a policy, the segment definitions and the barrier rules are updated in the backend. The client does not know about the change until it performs a new policy evaluation. To force this evaluation, you must sign out and sign back in, or clear the local cache that stores the old policy.
Steps to Force Teams to Apply the Updated Information Barrier Policy
Follow these steps in order. Each step forces Teams to discard the old policy data and fetch the new one.
- Verify the policy assignment in the Teams admin center
Go to Teams admin center > Information barriers > Policy segments. Confirm that the updated policy is listed and that the correct segments are defined. Also check the policy assignment for the affected user under Teams admin center > Users > Manage users > Policies. The information barrier policy should appear in the user’s assigned policies list. - Close Teams completely
Right-click the Teams icon in the system tray and choose Exit. Then open Task Manager with Ctrl+Shift+Esc and end any remaining Teams processes. Look for processes named Teams.exe, TeamsUpdater.exe, and ms-teams.exe. - Clear the Teams cache folders
Press Windows+R, type %appdata%\Microsoft\Teams, and press Enter. Delete the following folders and files: Application Cache, Cache, Code Cache, GPUCache, and Local Storage. Do not delete the entire Teams folder, only these items. - Sign out and sign back in
Launch Teams. Click your profile picture at the top right, then choose Sign out. Close the sign-in window and reopen Teams. Sign in with the affected user account. This forces a fresh authentication and a new policy evaluation. - Start a new chat to test the barrier
After signing back in, start a new chat with a user who belongs to a blocked segment. If the barrier is working, Teams will show a message that the chat is blocked. If the chat opens normally, the policy is still not applied or the user is not in the expected segment.
If the Barrier Still Does Not Block the Chat
If the chat is still allowed after clearing the cache and signing back in, check the following:
- Check the policy scope
Information barriers can be set to apply to all users or only to specific segments. Confirm that the affected users are included in the policy scope. - Wait for replication
Policy changes can take up to 24 hours to replicate across all Microsoft 365 services. Check back after a day if the change was made recently. - Verify the user’s segment membership
In the Teams admin center, go to Information barriers > Policy segments and open the segment that contains the user. Confirm that the user is listed.
If Teams Still Has Issues After the Main Fix
Teams Shows a Blank Window After Switching Work Accounts
If you see a blank window after signing out and back in, the cache may not have been fully cleared. Repeat the cache deletion steps and also delete the folder %appdata%\Microsoft\Teams\blob_storage. This folder stores temporary files that can become corrupted.
Information Barrier Applies to Some Users but Not Others
This usually means the policy is assigned to only a subset of users. Check the policy assignment under Teams admin center > Users > Manage users > Policies. If the user is missing the policy, assign it manually by selecting the user and choosing Edit.
Existing Chats Are Still Accessible After the Policy Change
Information barriers do not retroactively block existing conversations. You must start a new chat to see the effect. If you need to block an existing conversation, you must delete the chat or use a communication compliance policy to monitor it.
New Teams Desktop vs Teams on the Web: Policy Refresh Differences
| Item | New Teams Desktop | Teams on the Web |
|---|---|---|
| Policy refresh interval | Checks for updates at sign-in and then every 24 hours | Checks for updates at sign-in and then every 24 hours |
| Cache location | Local folders in %appdata%\Microsoft\Teams | Browser cache in the browser profile |
| How to force refresh | Clear local cache and sign out | Clear browser cache and sign out |
| Best for testing | Use the desktop app for most tests | Use the web app to test without clearing local files |
Both clients use the same server-side policy engine, so the refresh behavior is identical. The difference is the cache location. Clearing the cache in the desktop app requires deleting folders, while the web app cache is cleared through the browser settings.
After following these steps, you can force Teams to apply a changed information barrier policy within minutes instead of waiting for the automatic refresh. Start by verifying the policy assignment, then clear the cache and sign back in. If the barrier still does not block a chat, check the policy scope and segment membership. For ongoing issues, consider using the web client to test the policy without clearing local files. Remember that existing chats are not retroactively blocked, so always start a new conversation to verify the barrier.