Windows 11 26H1 not syncing: what to check first

If Windows 11 26H1 stopped syncing, the problem is usually one of four things: Microsoft account sign-in, OneDrive file sync, Windows settings sync, or incorrect date and time. Start by checking which one is actually failing, then confirm your account, network, and sync state before you change anything else. If the issue began right after 26H1, also check for a newer cumulative update or app update that may already fix it.

What “not syncing” usually means here

After a feature update like 26H1, “not syncing” can mean different things, and each one points to a different fix.

If your Microsoft account is the issue, you may see stale profile info, repeated sign-in prompts, or settings that no longer follow your other Windows devices. If OneDrive is the issue, files may stay stuck on “Processing changes,” show a cloud error, or stop appearing on another PC or the web. If Windows settings sync is the problem, themes, passwords, language preferences, or some personalization settings may stop carrying over. If the system clock is wrong, sync can fail in a way that looks unrelated because many Microsoft services rely on correct date, time, and region data.

The fastest way to narrow it down is to ask one question: is the problem limited to one app, one account, or the whole device? That tells you where to start and whether the issue is tied to a single profile or something wider.

Before you start

• Make sure this is a personal Windows 11 PC, or confirm that your organization allows you to change account and sync settings.
• Know whether the problem affects OneDrive, Microsoft account data, Windows settings sync, or the device clock.
• If OneDrive is involved, wait until you know your local files are safe before signing out.
• If the device is managed for work or school, policy may override the settings you are trying to change.

If Microsoft’s services are having a wider outage, local troubleshooting may not fix anything until the service recovers. If only one user profile is affected, the problem may be in that profile rather than the whole machine, so don’t assume the update is the only cause.

The safest fixes to try first

1. Confirm exactly what is failing.

Look for the narrowest symptom first. If OneDrive is stuck, open OneDrive and check whether files are uploading. If Windows settings are out of sync, compare one obvious setting, such as theme or language, with another device using the same Microsoft account. If the issue is time-related, check whether the clock is wrong or drifting after every restart.

2. Check that you are still signed in with the right Microsoft account.

Open Settings and confirm the account shown on the device is the one you expect. If you have both a local account and a Microsoft account, it is easy to think sync is broken when the device is actually signed into the wrong profile or only partially connected. If the account details look wrong, correct that first, because the rest of the steps depend on the right account being active.

3. Check internet access and whether sync is paused.

Make sure the PC has working internet, not just a connected Wi-Fi icon. Try a normal web page in a browser. Then check OneDrive or the app that is failing for a paused sync state, a metered-connection restriction, or a similar hold. If sync is paused, resume it and give it a minute to catch up before changing anything else.

4. Verify the date, time, and region settings.

Bad system time can break sign-in and sync in subtle ways, so check all three.

Settings > Time & language > Date & time
Settings > Time & language > Language & region

Turn on automatic time if it is off, confirm the time zone is correct, and make sure the region matches where the device is actually used. If the clock is wrong after every reboot, that can point to a deeper device issue, but you still want to fix the setting first because sync services often refuse to authenticate with an incorrect clock.

5. Restart the app or sync service.

Close the app that is stuck, then reopen it. For OneDrive, quitting and reopening the app is often enough to clear a temporary stall. If the problem is with Windows account-related sync, a normal restart can also help by reloading the sign-in token and any background services tied to that profile.

If the problem stays stuck after a restart, check whether a newer app update or cumulative Windows update is available. 26H1 issues are sometimes corrected in follow-up updates, so it is worth checking Windows Update and the app’s own update channel before trying more invasive changes. Because update availability changes over time, check the current official update source rather than relying on an older build note.

6. Sign out and sign back in.

If the app still does not sync, sign out of the affected Microsoft account in that app or in Windows, then sign back in with the same account. This refreshes the authentication token and often fixes a broken session after a major update.

If you use OneDrive on this PC, make sure files you need are fully uploaded before signing out. If upload status is unclear, wait until the sync state is stable or copy critical local-only files somewhere safe first.

If signing out does not help, restart the PC and sign in again once more. That can clear a stale session that a simple app restart did not fix.

7. Check for a newer cumulative update or app update.

If the problem started right after 26H1, the update itself may be part of the cause, but the fix may already be waiting in a later cumulative update or a newer version of OneDrive or the affected app. Open Windows Update, check for updates, and install anything current that applies to the device. Then open the Microsoft Store or the app’s own updater if the app is not managed through Windows Update.

If the device is on a managed network or a delayed update ring, the newest fix may not be offered immediately. In that case, check the current official update guidance from Microsoft or your organization instead of assuming the device is fully up to date.

8. Compare another profile or another device.

If only one Windows profile has the problem, the issue is probably in that profile rather than the whole machine. If your Microsoft account syncs fine on another PC but not this one, that points back to the 26H1 device. If it fails everywhere, the account or cloud service is the more likely layer to investigate.

This is the point where you stop guessing. A device-wide failure usually follows the system, network, or update path. A profile-only failure usually follows that user account or its cached sign-in data.

How to tell whether it worked

You know the fix worked when the failure stops being repeatable.

For OneDrive, files should begin uploading again and the stuck status should clear after a short wait or a reboot. For Microsoft account sync, settings should start matching the same account on another device again. For time-related problems, the clock should stay correct after restart, and sign-in or sync errors tied to authentication should disappear.

A good final check is simple: reboot the PC, sign in, and watch the affected app for a clean status. If the issue returns only after sleep, reboot, or a specific network, that pattern matters more than the one-time fix because it points to where the real problem still lives.

If nothing changed after the safest steps above, the next move is not to keep toggling settings at random. Check the newest cumulative update for 26H1, confirm the app version, and compare whether the problem is limited to one user profile or one device. That tells you whether the fix belongs in Windows, in the app, or in the account itself.

Conclusion

If the problem is still there after the checks above, focus on the newest update available for 26H1 and whether the failure follows one profile or one device. That will tell you whether you’re dealing with Windows itself, the app, or the account.

Frequently Asked Questions

Should I reinstall OneDrive if it stopped syncing after Windows 11 26H1?

Usually not first. Reinstalling is more disruptive than checking sign-in, paused sync, time settings, and the latest update. If those do not help, reinstalling the app can be the next step, but only after you know the files you need are safe.

Can bad time settings really stop syncing?

Yes. Incorrect date, time, or region settings can break Microsoft sign-in and sync in ways that look unrelated. Fix the clock first if it is off, then retry sync.