Kindly check if “/diageo02-th-ftp-prod/inbox/Archive/” archive folder been there in SFTP server or not. If not kindly create it and let us know.All files posted in /diageo02-th-ftp-prod/inbox/ should have delete permission
So that PO can archive to /diageo02-th-ftp-prod/inbox/Archive/ and delete from /diageo02-th-ftp-prod/inbox/.
Let me know if you need any more inputs.