Link:
Unlicensed OneDrive Accounts Report Available to SPO admins (office365itpros.com)
Report Detailing Unlicensed OneDrive for Business Accounts Available – blog by Tony Redmond
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SharePoint
How shareable links work in OneDrive and SharePoint in Microsoft 365
Link:https://learn.microsoft.com/en-gb/sharepoint/shareable-links-anyone-specific-people-organization