OneDrive Not Working? Common Errors & Fixes

Usually the OneDrive client is stuck, the account is out of storage, or a file breaks OneDrive's name/path limits. Restart OneDrive, check storage, rename long paths, and reset the client if it is still stuck.

Microsoft says 0x8004de40 means OneDrive is having trouble connecting to the cloud. It is almost always a network, proxy/VPN or TLS setting problem on the PC, not your account.

This error appears when you open or move an online-only (Files On-Demand) file while the OneDrive client is paused, stopped or broken. Resume or restart OneDrive first; if it persists, reset OneDrive or turn off Files On-Demand.

OneDrive PC folder backup moves Desktop, Documents and Pictures into OneDrive. Turn the Desktop toggle off in Manage backup — but the files stay in OneDrive, so you must move them back to the local Desktop yourself.

OneDrive syncs deletions both ways: removing files from the OneDrive website or folder to free cloud space also deletes them from every synced PC, including a backed-up Desktop. Restore them from the OneDrive recycle bin, and stop backup or move files out before cleaning up cloud storage.

Microsoft lists 0x8004def7 as storage full or account suspended. Free space or upgrade storage and OneDrive resumes syncing.

Microsoft lists 0x8007018b as a file being open or in use while OneDrive tries to sync it. Close the file, let sync finish, then try the move or delete again.

These sign-in errors usually follow a password change or a mix-up between a personal Microsoft account and a work/school account. Sign out of OneDrive and sign back in with the right account.

Usually a file is open, a very large file (ZIP, video, Outlook PST/OST) is uploading, you are signed out, or hidden/temporary files block sync. Close open files, move large files out, sign in again, and unlink and re-link OneDrive if it never finishes.

OneDrive uses lots of CPU when it keeps rescanning many files or retries a sync that cannot complete, often after a Windows update. Pause sync to confirm, then reset OneDrive and reduce the folders it syncs.

On iPhone it usually stops because of iCloud Photos 'Optimize Storage', Low Power Mode or Background App Refresh; on Android because of media permissions or metered-connection settings. Toggle Camera Upload off and on, then fix the phone setting that is blocking it.