Fix Azure AD Sync
After changing the source of sourceAnchor that gets used for mapping on-premise users to Azure AD users (i.e. after a cutover migration or other nice things), the ImmutableId in Azure AD needs to be changed. Here's how to get this done.
Connect via Connect-MsolService
Disable Directory Sync (could take up to 72h for completion, status possibly shows false prior to that):
<syntaxhighlight lang=powershell>Set-MsolDirSyncEnabled –EnableDirSync $false</syntaxhighlight>
Check status (should be false):
<syntaxhighlight lang=powershell>(Get-MSOLCompanyInformation).DirectorySynchronizationEnabled</syntaxhighlight>
Generate new ImmutableId from domain account for sourceAnchor (here: objectGuid):
<syntaxhighlight lang=powershell>[system.convert]::ToBase64String((Get-ADUser user).objectGUid.ToByteArray())</syntaxhighlight>
Set new ImmutableId for MsolUser:
<syntaxhighlight lang=powershell>Set-MsolUser -UserPrincipalName user@contoso.com -ImmutableId "01234567890123456789=="</syntaxhighlight>
Enable Directory Sync (only possible after disabling has completed, could take 24h hours after enabling to complete):
<syntaxhighlight lang=powershell>Set-MsolDirSyncEnabled –EnableDirSync $true</syntaxhighlight>
