A Microsoft file hosting and synchronization service.
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Open an incognito tab and sign in with your Microsoft account here -
Go to Settings > Accounts > Storage.
Expand the 'Microsoft Storage' and 'Email Storage' Sections.
Ensure you have enough storage space.
Note-
If you have recently upgraded your storage due to it being full, your account may be in a frozen state. After upgrading, it usually takes up to 24 hours for the storage to sync across all devices where you’re signed in.
If you’re still experiencing issues after 24 hours, right-click the OneDrive icon in the taskbar, go to Settings > Accounts, and sign out of your account.
Then, sign in again. See if your storage is being synced.