Hi, I'm John! I will help you with this.
Could you please confirm if you’re seeing this message both on the OneDrive website and in the OneDrive app on your PC, or only in one of them?
Also, have you checked if there are any shared folders or items in your recycle bin that might still be taking up space?
After receiving the “storage full” message, did you clean up your OneDrive storage? If so, it can sometimes take 24 to 48 hours before the new quota syncs correctly across all devices.
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Regards,
John J.D.