OneDrive is personal storage for uses to store their files. By default, even if global administrator does not have permission for each user's OneDrive.
There is a workaround to retrieve is the OneDrive sharing report for all users.
1.Grant your account with admin permission for all users' OneDrive.
2.Run script in the following article.
https://practical365.com/reporting-on-onedrive-for-business-shared-files/
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