Error "503 SERVICE UNAVAILABLE"in onedrive.live.com

The behavior indicates an issue with the regular browser profile (cookies/cache or session data), not with OneDrive itself, since it works in Incognito.

Try these steps in order in Chrome (non‑incognito):

1. Clear OneDrive/Microsoft cookies and site data
   • In Chrome, go to Settings → Privacy and security → Cookies and other site data → See all site data and permissions.
   • Search for live.com, microsoft.com, and onedrive.
   • Remove the stored data for these entries.
   • Close all Chrome windows, reopen Chrome, and try signing in to OneDrive again.
2. Clear cache for the affected sites
   • Go to Settings → Privacy and security → Clear browsing data.
   • Select “Cached images and files” (optionally limit the time range to “Last 7 days” or “Last 4 weeks”).
   • Clear data, then restart Chrome and try again.
3. Disable extensions temporarily
   • In Chrome, go to More tools → Extensions.
   • Temporarily disable ad blockers, privacy, or security extensions.
   • Retry logging in to OneDrive. If it works, re‑enable extensions one by one to find the culprit.
4. Check for service issues
   • If multiple users on the same network see 503 errors to OneDrive or other Microsoft 365 services, there may be a temporary service issue or throttling on the service side. In that case, wait and try again later.

If the problem persists only in the normal profile after these steps, create a new Chrome profile and sign in to OneDrive there; if it works, the original profile’s data is corrupted and should be avoided or reset.

References:

• Unable to access SharePoint Online
• Fixes or workarounds for recent issues in OneDrive