If you need take ownership of an employees OneDrive, run the following PowerShell code.
Some requirements before running the script.
- Azure Active Directory PowerShell Module: https://msdn.microsoft.com/en-us/library/azure/jj151815(v=azure.98).aspx
- SharePoint Online Management Shell: https://www.microsoft.com/en-us/download/details.aspx?id=35588