'One or more UserId parameters are invalid.' error message occurred during a migration. (4237944)

'One or more UserId parameters are invalid.' error message occurred during a migration.

MNE Environment Details:

NME: 4.12.1.11 Windows Server 2012 R2 Standard 64Bit.
SQL: SQL Server Express 2012 64Bit 11.0.2100.60.
Exchange: Exchange Server Online Office365 15.1.337.19.
Domino: Server 8.5.3
Notes Client: Lotus Notes 8.5.3 FP6 32Bit.
Outlook: Outlook 2013 32Bit.

The MNE verbose log file has the following error messages:

15:41:34 WARNING: [5071-208-4-00000000]The following delegates are not added to Exchange:
15:41:34 Error Message: One or more UserId parameters are invalid. Make sure that the PrimarySmtpAddress, Sid and DisplayName properties refer to the same user when specified. Error: UserId.SID = , userPrincipal.SID = S-1-5-21-1325022448-1227114703-2827371832-1950253 : UserId.PrimarySmtpAddress = yourname@yourdomain.com, userPrincipal.PrimarySmtpAddress = yourname@yourdomain.com : UserId.DisplayName = , userPrincipal.DisplayName = NOTES-OFF365
15:41:34   Smtp Address: yourname@yourdomain.com
15:41:34 Error Message: This is an invalid operation. Cannot add owner as delegate.
15:41:34   Smtp Address: yourname@yourdomain.com
15:41:34 Autodiscovering connection settings
15:41:51 nnotes.dll version is 8.5.36.13325
15:41:51 DB Mode: Using NSFDbOpenExt
15:41:51 Soft Delete Mode: Using NSFNoteOpenSoftDelete
15:41:51 C:\Program Files (x86)\IBM\Lotus\Notes\nxrtf2.dll version is 8.5.36.13325
15:41:51 Using C:\Program Files (x86)\IBM\Lotus\Notes\nxrtf2.dll
15:41:51 Using RTF export function
15:41:51 ------------------------------
15:41:51 Estimates:
15:41:51 Acquired lock 'NOTESLOCK', continuing with operation.
15:41:51 Acquired lock 'NOTESLOCK', continuing with operation.
15:41:51 Acquired lock 'NOTESLOCK', continuing with operation.
15:41:51 Migrating as a mail database.

MNE has checked with Active Directory and found that “One or more UserId parameters are invalid”.
The error message tries to help and says “Make sure that the PrimarySmtpAddress, Sid and DisplayName properties refer to the same user when specified”.

Active Directory may have more than one user that has the same SMTP Address and/or SID and/or Display Name and therefore causes this error to happen. These should be unique items.
Check the SMTP Address/SID/Display Name within Active Directory to see where the duplications are and rectify accordingly, as the issue is outside of MNE.