I have used the code below on outlook 2010 without any glicthes but with 2016 outlook it does nothing and gives no error.
sub copylastsenttomem ()
Dim objSentFolder As Outlook.MAPIFolder
Dim objSentItem As Outlook.MailItem
Dim outForward As Outlook.MailItem
Dim objNS As Namespace
Dim objFolder As MAPIFolder
Set objNS = GetNamespace("MAPI")
Set objFolder = objNS.GetDefaultFolder(olFolderSentMail)
Set outForward = objFolder.Items(1).Forward
'Set outForward = objFolder.Items(1)
'outForward.Display
Dim M As MailItem, Buf As MSForms.DataObject
Set M = outForward
Set Buf = New MSForms.DataObject
Buf.SetText M.body
Buf.PutInClipboard
end sub