OneDrive log-on and sync issues

After unlinking OneDrive, sign-in and sync issues are usually caused by account, configuration, or connectivity problems. Use these steps to get OneDrive working again:

1. Confirm the account and password

• Open a browser and sign in to the Microsoft account dashboard to verify the username and password work: see step 1 under Can't sign in in the OneDrive issues article.
• If sign-in fails in the browser, use the Microsoft account sign-in helper linked from the OneDrive sign-in troubleshooting page.

2. Check basic OneDrive sign-in

• If the OneDrive icon is gray or has a line through it, select it and complete the Set up OneDrive wizard by entering the email address and password.
• If this is a work or school account and sign-in fails, reset the password or contact the organization’s IT admin as described in Can't sign in to OneDrive.

3. Re-link OneDrive properly (Windows) Since OneDrive was unlinked, re-linking is required:

• Select the OneDrive cloud icon in the notification area.
• Select Help & Settings > Settings.
• On the Account tab, if the PC is still listed, select Unlink this PC and confirm.
• Press Windows + R, enter: %localappdata%\Microsoft\OneDrive\settings and select OK.
• Delete the file PreSignInSettingsConfig.json to clear cached sign-in settings.
• Start OneDrive again (Windows key, type OneDrive, select the app) and sign in when prompted.
• When prompted that a OneDrive folder already exists, choose Use this folder (or Choose new folder if a different location is desired).

4. If sign-in still fails with an error code

• For error 0x8004def7:
  • Check OneDrive storage usage. If the storage limit is exceeded or nearly full, delete files or folders in OneDrive to free space.
  • If storage is fine, unlink and re-link OneDrive again as above.
  • If the issue persists, reset OneDrive using the steps in the Reset OneDrive article; this resets settings and forces a full resync.
• For errors 0x8004de80 or 0x8004de86:
  • Unlink and re-link OneDrive to the correct account.
  • If needed, uninstall OneDrive from Apps & features, then download and reinstall the latest OneDrive client and sign in again.
  • If multiple accounts are involved, clear cached Office account identities as described under Clear out multiple identities.

5. Check connectivity and firewall/VPN

• If OneDrive reports not being connected or cannot reach the service while the rest of the internet works:
  • Make sure the latest version of OneDrive is installed.
  • Temporarily disconnect from VPNs or security software that might block Microsoft 365 endpoints.
  • If necessary, verify that the required URLs and ports for OneDrive are allowed, as described in the OneDrive issues article.

6. If the OneDrive app still won’t connect

• Use the OneDrive sync troubleshooter linked from Fix OneDrive sync problems.
• If the problem persists across devices and networks after these steps, contact Microsoft support with the exact error code shown during sign-in.

References:

• Error 0x8004def7 when signing in to OneDrive
• Error 0x8004de80 or 0x8004de86 when signing in to OneDrive
• Fix OneDrive sync problems
• Unlink and re-link OneDrive
• Can't sign in to OneDrive
• Fixes or workarounds for recent issues in OneDrive