OneDrive and Office Sign-in Error 0x8004DE40: Login Was Interrupted or Unsuccessful
0x8004DE40 means the client cannot connect to the cloud. Microsoft’s documented fixes are TLS protocol and cipher suite settings, then a device rejoin.
OneDrive 0x8004de40 and 0x8004de88: the sync app cannot reach the cloud
0x8004de40 means the OneDrive sync app cannot complete a secure connection. Fix the TLS versions, cipher order and proxy that cause the sign-in to fail.