ONprem to Online move failed

Dear All,

We have hybrid environment with Exchange 2010 and O365. On a daily basis we create and move mailboxes from onprem to online. We noticed few of our mailboxes are not being migrated to online due to the below error.

NO recent changes were made to the source and Online infrastructure.

The operation couldn't be performed because object 'ahmed@out.look.co' couldn't be found on
'BN3PR.PROD.OUTLOOK.COM'.
    + CategoryInfo          : NotSpecified: (:) [Get-Mailbox], ManagementObjectNotFoundException
    + FullyQualifiedErrorId : [Server=BLUP48,RequestId=0fe97a5e-ff63-454a-9021-b101e62032d1,TimeStamp=10/24/2
   015 12:15:26 AM] [FailureCategory=Cmdlet-ManagementObjectNotFoundException] 40482610,Microsoft.Exchange.Management
  .RecipientTasks.GetMailbox
    + PSComputerName        : outlook.office365.com

The call to 'https://outlook.out.look.com/EWS/mrsproxy.svc' failed because no service was listening on the
specified endpoint. Error details: There was no endpoint listening at https://outlook.out.look.com/EWS/mrsproxy.svc
that could accept the message. This is often caused by an incorrect address or SOAP action. See InnerException, if
present, for more details. --> The remote server returned an error: (404) Not Found.
    + CategoryInfo          : NotSpecified: (:) [New-MoveRequest], RemoteTransientException
    + FullyQualifiedErrorId : [Server=BLUP48,RequestId=13ca8b3f-491a-4800-bdcf-0ebbd0f60592,TimeStamp=10/24/2
   015 12:16:08 AM] [FailureCategory=Cmdlet-RemoteTransientException] 753C135F,Microsoft.Exchange.Management.Recipien
  tTasks.NewMoveRequest
    + PSComputerName        : outlook.office365.com
o365AdmAsked:
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o365AdmAuthor Commented:
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