2010>2016 PF Migration completion issue

I am in the process of performing a Public Folder structure migration form Exchange 2010 t0 2016

So far everything went as advertised and I am at the step when I have to "complete" the migration:

[PS] C:\Windows\system32>Complete-MigrationBatch PFMigration
Before finalizing the migration, it is necessary to lock down public folders on the legacy Exchange server (downtime
required). Make sure public folder access is locked on the legacy Exchange server and then try to complete the batch
again.
    + CategoryInfo          : NotSpecified: (:) [Complete-MigrationBatch], MigrationBatchCannotBeCompletedException
    + FullyQualifiedErrorId : [Server=EX-SX-01,RequestId=e3fe7883-13dc-4539-a77c-d663023648cf,TimeStamp=3/19/2017 7:02
   :02 PM] [FailureCategory=Cmdlet-MigrationBatchCannotBeCompletedException] 2DF6145E,Microsoft.Exchange.Management.M
  igration.MigrationService.Batch.CompleteMigrationBatch
    + PSComputerName        : ex-sx-01.domain.local

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However

[PS] C:\Windows\system32>Get-OrganizationConfig  | fl *Migration*

PublicFoldersLockedForMigration        : True
PublicFolderMigrationComplete          : False
PublicFolderMailboxesMigrationComplete : False
MaxConcurrentMigrations                : Unlimited
IsExcludedFromOnboardMigration         : False
IsExcludedFromOffboardMigration        : False
IsFfoMigrationInProgress               : False

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And on the source server

[PS] F:\pss>Set-OrganizationConfig -PublicFoldersLockedForMigration:$true
[PS] F:\pss>Get-OrganizationConfig  | fl *Migration*

PublicFoldersLockedForMigration : True
PublicFolderMigrationComplete   : False

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Now I understand that this might take some time to propagate but I feel there is still something missing...