User Log in to Synchronize fail

Question

User Log in to Synchronize fail

DearMrH 0

Hi

Family Safety pops up everytime pc starts up to log in with user.

Small black box pops up, shortly after a white box and disaperears.

I can do it again and again. Log in not possible.

And same for Edge. User log in not possible. White box pops up and close. Not even possible to type in password. Just closing.

Tried reset, Clearing browser. Reinstalled Edge. Nothing works.

I have another pc and this works perfectly. No Log in issue.

Everything in Windows Update is up to date.

Hope for some help. Google is not my friend at this moment :)

Mukesh D 30 Reputation points

2026-02-16T03:41:28.6066667+00:00

You could try signing out of Family Safety completely and then removing the affected account from Settings → Accounts → Email & accounts, restart the PC, and add the account again. Sometimes the sign-in window closes if the account token is corrupted. Also check if any third-party security software is blocking the login pop-up. If possible, try creating a new local Windows user account and test the login there to confirm whether it’s profile-related.

2 answers

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Mukesh D 30 Reputation points

2026-02-16T03:41:28.6066667+00:00

You could try signing out of Family Safety completely and then removing the affected account from Settings → Accounts → Email & accounts, restart the PC, and add the account again. Sometimes the sign-in window closes if the account token is corrupted. Also check if any third-party security software is blocking the login pop-up. If possible, try creating a new local Windows user account and test the login there to confirm whether it’s profile-related.

Answer 1

Hendrix-V 11,515 Microsoft External Staff Moderator

Hi DearMrH,

Welcome to the Microsoft Q&A forum.

From your description, it looks like the sign‑in window briefly opens (small black box > white box) and then closes before you can enter your password.

Please follow the troubleshooting steps below to focus on refreshing the Windows sign‑in experience that Edge, Family Safety, and other Microsoft apps rely on:

1, Clear stored Microsoft sign‑in credentials

Press Win + R, type control, press Enter
Open Credential Manager > Windows Credentials
Remove entries related to Microsoft, MSA, or OneAuth
Restart the PC

2, Repair Windows sign‑in components

Open Command Prompt (Run as administrator)
Run sfc /scannow
Then run DISM /Online /Cleanup-Image /RestoreHealth
Restart when finished

3, Reset Microsoft Edge settings

Open Edge and go to edge://settings/reset
Select Restore settings to their default values
Restart Edge and try signing in again

4, If the issue continues:

Create a new Windows user profile
Sign in to Edge or Family Safety from that profile

If it works there, it confirms the original Windows profile is affected, and moving to a new profile is the most reliable workaround.

Let me know if you need further assistance, feel free to ask me by clicking "Add Comment" or "Add Answer" if you cannot add comment so your response will be visible. Thanks for your effort.

Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.

Ian-T 7,545 Reputation points Microsoft External Staff Moderator

2026-02-18T14:40:49.55+00:00

Hi,

I’m following up to check on the status of this issue.

Have you had an opportunity to review the answer shared earlier?

Any update you can provide would be greatly appreciated.
DearMrH 0 Reputation points

2026-02-20T14:17:57.16+00:00

Hi again

Did 1-2-3 - Not working

Number 4 not possible.

When I want to add a new Microsoft account, same thing happens. Black box for 2 seconds and then white and disappear 😩
Hendrix-V 11,515 Reputation points Microsoft External Staff Moderator

2026-02-21T07:12:46.4866667+00:00
Hi DearMrH,

Thank you for confirming the results.

Based on what you’ve described, the sign‑in window briefly appearing (black box > white box > closing) across Edge, Family Safety, and when adding a new Microsoft account indicates that the Windows sign‑in experience on this PC isn’t loading correctly. Since the same account works on another device and the issue happens before a password can be entered, this is not related to the account itself or browser settings.

At this point, the remaining supported option is performing a system‑level refreshe that restore the Windows sign‑in components.

Please consider a Windows repair install (keeps files and apps)

Download the Windows 11 ISO from Microsoft official site

Open (mount) the ISO

Run setup.exe

Choose Keep personal files and apps

Complete the repair and restart

After these steps, Microsoft account sign‑in for Edge and Family Safety should function as expected again. I know this has taken time and effort, and you’ve done all the right troubleshooting so far.
Haytham-C 4,125 Reputation points Microsoft External Staff Moderator

2026-02-23T05:44:30.2766667+00:00

Hello DearMrH,
Did you have the chance to check Hendrix's additional step yet?
Please do keep us updated.

Answer 2

It sounds like you're experiencing issues with logging in and synchronizing your Microsoft account on your PC, particularly with Family Safety and Microsoft Edge. Here are some troubleshooting steps you can try:

Check for Account Status: Ensure that your Microsoft account is active and not disabled. You can do this by signing into your account on another device or through the Microsoft website.
Clear Credentials: Sometimes, stored credentials can cause login issues. Go to Control Panel > User Accounts > Credential Manager and clear any stored credentials related to your Microsoft account.
Check for Group Policies: If you're in a managed environment, check if there are any group policies that might be preventing you from logging in or syncing. You can do this by going to edge://policy/ in Microsoft Edge.
Resync Microsoft Edge: In Edge, go to Settings > Profiles > Sync and try to resync your data. If that doesn't work, consider resetting the sync settings.
Event Viewer: Check the Event Viewer for any error messages related to the login attempts. Look under Windows Logs > Application or System for any relevant errors.
Reinstall Edge: Since you've already tried reinstalling Edge, ensure that you completely remove all user data during the uninstall process. You can do this by going to Settings > Apps > Apps & features, selecting Edge, and choosing to uninstall.
Windows Update: Ensure that your Windows is fully updated. Sometimes, pending updates can cause issues with system functionalities.

If these steps do not resolve the issue, you may want to consider reaching out to Microsoft support for further assistance.

References:

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User Log in to Synchronize fail

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