PowerShell Hard Link AD Sync User

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The process of hard linking AD objects to AAD objects for when you get errors during an AD Sync.

On the domain controller run:
Get-ADUser username | Select-Object UserPrincipalName, objectGUID, @{Name = 'ImmutableID'; Expression = { [system.convert]::ToBase64String(([GUID]$_.objectGUID).ToByteArray()) } }

Transfer the Immutable ID from AD over to the code below and run this against the user in AAD.
Set-MsolUser -UserPrincipalName [email protected] -ImmutableId ID_FROM_AD_HERE