Added Files

Powershell/PowerShell-Office365Admin/OneDrive/OneDriveForBusinessAddAdmin.ps1

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+# Add a collection administrator to your users' OneDrive for Business accounts
+#
+# Requires the Sharepoint Online PowerShell module to be installed
+#
+
+# The name of your Office 365 organization
+# This can be found in your Sharepoint URL before the '-my', eg: https://thecompany-my.sharepoint.com/
+$spoTenantName=''
+
+# The UPN of the account you wish to add as a secondary admin
+$secondaryAdminUPN = ''
+
+# The list of UPNs for the accounts you wich to add the secondary admin to
+$userList = @('','')
+
+# Connect to Sharepoint Online
+Import-Module Microsoft.Online.SharePoint.PowerShell -DisableNameChecking
+Connect-SPOService -Url ('https://' + $spoTenantName + '-admin.sharepoint.com')
+
+# Create the base URL for OneDrive for Business
+$spoBaseURL = 'https://' + $spoTenantName + '-my.sharepoint.com/personal/'
+
+# Add secondary admin to each user in the list
+foreach ($userUPN in $userList) {
+    $spoURL = $spoBaseURL + ($userUPN.ToLower() -replace "[@.]", "_")
+    Set-SPOUser -Site $spoURL -LoginName $secondaryAdminUPN -IsSiteCollectionAdmin $true -ErrorAction:Continue
+}