When attempting to set forwarding rule, action sporadically fails with the following "ERROR: [139 (42940)

When attempting to set forwarding rule, action sporadically fails with the following error:

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12:22:37 ERROR: [1395-31-10-00000000] Unable to set forwarding and/or disable foreign dirsync for user FirstName LastName
12:22:37 Search of Name and Address Book returned zero matches.
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...or...

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08:51:03 ERROR: [1395-31-14-00000000] Unable to set forwarding and/or disable foreign dirsync for user FirstName LastName
08:51:03 Person document is read-only.
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The ID file/Notes user specified within the Notes Server area of Quest Notes Migrator for Exchange is not a Notes Administrative account. The account and ID file specified here must have the ability to modify Notes Users attributes within their user document.

Please determine which Notes ID file is associated with a Notes Administrative account and set the NotesID file to this account in the Notes Server area of Quest Notes Migrator for Exchange and retry the action.

Note that this error will also occur if for whatever reason the SourceAddress column is not populated with the Notes Address during directory export. This can be established by highlighting the collection & exporting to TSV, then opening the resultant TSV file with MS Excel & viewing the relevant column.

Some earlier versions of NME had a problem with the population of this column during directory export, so if this issue is encountered please contact Quest Technical Support confirming your product version number where further advice can be obtained in order to update to the current release if required.