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Prerequistes:

  • Global Admin or SharePoint Admin

Gaining Access:

  • In the admin center, go to the Users > Active users page.
  • Select a user.
  • On the user properties page, select OneDrive.
  • Under Get access to files, select Create link to files.
  • Select the link to open the file location.
  • Download the files to your computer, or select Move to or Copy to to move or copy them to your own OneDrive or to a shared library.

References:

Step 5 - Give another employee access to OneDrive and Outlook data - Microsoft 365 admin
Follow the steps in this article to access a former employee’s OneDrive and Outlook data, back it up, and choose whether to give access to another employee.