Hi Graham Lucy,
I can understand how frustrating it is when sign-in problem is affecting Microsoft Edge and the Microsoft Store. That suggests the source may be with the Windows account authentication components rather than any application alone. Just wondering, have you checked whether the Microsoft account itself is working as the AI answer suggested?
If web sign-in also fails, the issue comes from the account itself rather than Edge or Store. If the account works in a browser, it'd be helpful if you can narrow it down more by testing in another local account: if the signing in works there, the problem is with your current profile, and vice versa. Besides that, please try the following:
- Verify date, time, and region are correct:
- Open Settings > Time & Language > Date & time
- Toggle Set time & time zone automatically ON
- If they're already on, turn OFF > restart PC
- Come back and toggle them back ON.
- Check whether the Windows account is properly connected:
- Open Settings > Accounts > Your info
- If you see any
Verify/Fix/Add... link > click it - Complete the missing info > restart PC and check again.
- If the issue still persists, open Control Panel > Credential Manager
- In Windows Credentials, remove any entries related to:
-
MicrosoftAccount -
login.live.com -
login.microsoftonline.com
-
- Restart the PC and try signing in to Edge/Store again.
- In Windows Credentials, remove any entries related to:
If possible, consider sharing your Windows version and the exact error code you saw. Different sign-in failures require different troubleshooting paths, so without those details, we can only provide general sign-in troubleshooting as above.
If you think the answer is helpful to you, please mark this as accepted. If you have extra questions about this answer, feel free to click "Add Comment" and ask!
Note: Follow the steps in our documentation if you want to enable and receive the related email notifications for this thread.