You start a conversation with Copilot on your laptop, then open Copilot on another device and find nothing — no shared history, no continuity, as if the two apps belong to different people. Cross-device sync is supposed to make Copilot feel like one assistant everywhere, and when it breaks, every device feels like a stranger. The fix is usually about accounts and settings rather than anything deeply technical.

Sync failures divide into a few clear causes. Different accounts on different devices is the most common and the most easily missed, especially when personal and work accounts look similar. Disabled sync settings, outdated apps, and network problems cover most of the rest. Checking them in order avoids resetting devices that were never the problem.

Related hibernation and local-model issues can also disrupt background sync. If your laptop struggles with sleep states, see our guide to hibernate not working on AI PCs , and if you use local AI models, check Foundry local model download stuck . Image generation credit problems, covered in our guide to image creator credits exhausted , can also look like sync failures when they are really account issues.

Why this happens

  • Different accounts per device: Each device syncs to its own signed-in account, so mismatched accounts mean separate histories.
  • Sync disabled in settings: A privacy or sync toggle turned off on one device stops that device from sharing or receiving history.
  • Outdated app versions: Older Copilot versions sync differently and may not show history created on newer versions.
  • Network or service outage: Sync needs connectivity and a healthy Microsoft service; either failing stalls updates.
  • Work vs personal account mixing: Work accounts often have sync restricted by policy, so history stays local.
  • Corrupted local cache: A damaged cache on one device can block its sync without affecting others.
  • New device not yet synced: A freshly signed-in device needs time to download history, which looks like failure in the first hour.

How to fix it

Work through these in order — diagnose first, then act.

Fix 1: Verify the same account on every device

This is the fix that resolves the majority of sync complaints. Open Copilot on each device and compare the signed-in account character by character — personal and work accounts are easy to confuse.

  1. Open Copilot on each device and note the signed-in account.
  2. If any device differs, sign out there.
  3. Sign back in with the matching account.
  4. Wait 15 to 30 minutes for history to sync.
  5. Compare history across devices.
  6. Keep a note of the correct account for future device setups.

Fix 2: Check sync and privacy settings on each device

A single device with sync disabled breaks the chain for that device only, which is why history can appear on two devices but not a third. Review the setting on every device, not just the one that looks broken.

  1. Open Copilot settings on each device.
  2. Find history, sync, or privacy options.
  3. Confirm history saving and sync are enabled everywhere.
  4. Turn off any auto-delete setting that could prune synced chats.
  5. Save and restart Copilot on each device.
  6. Wait for a fresh sync cycle and recompare.

Fix 3: Update Copilot everywhere

Version mismatches cause subtle sync gaps: a chat created on a new version may not appear on an old one. Updating every device to the latest Copilot app removes this whole class of problem.

  1. Open the Microsoft Store on each device.
  2. Update Copilot to the latest version.
  3. Update Windows as well, since Copilot features track OS builds.
  4. Restart each device after updating.
  5. Sign into Copilot on each device.
  6. Wait and compare history again.

Fix 4: Force a fresh sync with sign-out and sign-in

There is no sync button, but signing out and back in is the practical equivalent. It clears the local session and forces a full re-download of history from the cloud.

  1. On the device missing history, sign out of Copilot.
  2. Close the app completely.
  3. Reopen it and sign back in with the correct account.
  4. Wait 15 minutes without closing the app.
  5. Check whether history appears.
  6. Repeat on other devices if they also lag.

Fix 5: Check network and service health

Sync cannot happen without a stable connection and a healthy service. A device on a restricted network — a corporate firewall, a captive portal, or a VPN that blocks Microsoft services — will silently fail to sync while everything else seems online.

  1. Confirm the device’s internet connection works for other services.
  2. Temporarily disconnect any VPN and test sync.
  3. Try a different network, such as a phone hotspot, to isolate firewall issues.
  4. Check Microsoft’s service status for Copilot outages.
  5. If an outage is in progress, wait and retry later.
  6. Reconnect the VPN afterwards if it proves unrelated.

Fix 6: Repair the app cache on the lagging device

A corrupted cache can block sync on one device while others work fine. Repairing the app clears the cache and forces a clean re-download, which is the right fix when the problem is device-specific.

  1. Open Settings, go to Apps, then Installed apps.
  2. Find Copilot and open Advanced options.
  3. Choose Repair.
  4. Relaunch Copilot and sign in.
  5. Wait for history to sync.
  6. If Repair fails, choose Reset and repeat the sign-in.

Fix 7: Check for policy restrictions on work devices

Work and school devices may have sync restricted by IT policy, and no settings change on the device can override that. If a work device never syncs while personal devices do, policy is the likely explanation.

  1. Identify whether the lagging device is work- or school-managed.
  2. Check for greyed-out sync or privacy options.
  3. Ask your IT administrator whether Copilot sync is permitted.
  4. If restricted, accept that the work device will keep separate history.
  5. Use the web version of Copilot on that device as a workaround if allowed.
  6. For personal devices, see the official Windows support pages for further help.

Closing

Copilot sync failures are usually account mismatches, disabled settings, or outdated apps — all checkable in minutes across your devices. Verify the account everywhere first, then settings, then versions, and sync usually restores itself. Once it is working, Copilot finally feels like one assistant, picking up wherever you left off, on whichever device you happen to be using.

Frequently asked questions

Why isn't Copilot syncing between my devices?
The usual causes are different Microsoft accounts on each device, sync disabled in settings, a network or service issue, or one device running an outdated Copilot app version that syncs differently from the others.
What does Copilot sync actually include?
Copilot syncs chat history and some preferences tied to your Microsoft account. It does not sync local files, device-specific settings, or conversations from a different account, so expectations matter.
How long does Copilot sync take?
Sync is usually quick, but after signing in on a new device or after an outage it can take several minutes to an hour for full history to appear. Patience plus a manual sign-out and sign-in resolves most lags.
Can I force Copilot to sync now?
There is no manual sync button. Signing out and back in, updating the app, and ensuring a stable connection are the practical ways to trigger a fresh sync on each device.