Added Files

Powershell/PowerShell-Office365Admin/MSOnline/FixDuplicateSyncObject.ps1

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+# Remove a duplicate 365 account created by a faulty sync and reconnect
+# the orphaned 365 user to the AD account.
+# 
+
+# Get correct and incorrect account details
+$adUsername = Read-Host -Prompt 'Enter username for AD account'
+$msolIncorrectUPN = Read-Host -Prompt 'Enter UPN for the duplicate object in MSOL'
+
+# Connect to MS Online
+Import-Module MSOnline
+Connect-MsolService
+
+# Get AD user account
+$adObject = Get-ADUser -Identity $adUsername
+
+# Get correct UPN from AD account
+$msolCorrectUPN = $adObject.UserPrincipalName
+
+# 
+try {
+    Get-MsolUser -UserPrincipalName $msolCorrectUPN -ErrorAction Stop
+
+    Remove-MSOLuser -UserPrincipalName $msolIncorrectUPN
+    Remove-MSOLuser -UserPrincipalName $msolIncorrectUPN -RemoveFromRecycleBin
+
+    $adGuid = $adObject.ObjectGuid
+    $immutableID = [System.Convert]::ToBase64String($adGuid.ToByteArray())
+
+    Set-MSOLuser -UserPrincipalName $msolCorrectUPN -ImmutableID $immutableID
+}
+catch {
+    Write-Host 'No account found in Azure AD matching the UPN for that AD account.'
+}