Migrate O365

"C:\Program Files\Windows Azure Directory Sync\DirSync\DirSyncConfigShell.psc1"
Import-Module msonline
$cred = Get-Credential
Connect-MsolService -cred $cred

$msolusers = Get-MsolUser -Verbose
$OLcurrentuser = $msolusers|where-object{$_.UserPrincipalName -ilike "*Burton*" -and $_.UserPrincipalName -notlike "*test*"}
#$OLcurrentuser.ObjectId
$FN = $OLcurrentuser.FirstName
$LN = $OLcurrentuser.LastName

$aduser = Get-ADUser -filter *|where-object{$_.GivenName -eq $FN -and $_.Surname -eq $LN -and $_.UserPrincipalName -notlike "*test*"}
$adguid = $aduser.ObjectGUID
#$OLcurrentuser.ObjectId = $adguid
$immutableID = [System.Convert]::ToBase64String($adguid.tobytearray())
Set-MSOLuser -UserPrincipalName $OLcurrentuser.UserPrincipalName -ImmutableID $immutableID
#Set-MSOLuser -UserPrincipalName $OLcurrentuser.UserPrincipalName -ImmutableID $adguid
$OLcurrentuser.ImmutableId

Start-OnlineCoexistenceSync -Fullsync