Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
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Please make sure OneNote is signed in with the same Microsoft account linked to your OneDrive. Then try these:
Click Sign in again in OneNote.
Ensure OneDrive is running and your internet is stable.
Update OneNote and Office via the Mac App Store.
Export notes locally via File > Export as a backup.
Restart your Mac and reopen OneNote to retry syncing.