Hi,
In this case you will have to delete the data on the storage and make space or else upgrade the storage limits on the oneDrive. Check the steps and process over here if it helps - https://support.microsoft.com/en-au/office/i-m-getting-a-disk-full-message-in-onedrive-b875f98b-7a0f-424a-ae87-d5e8af224fb7
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