System.Exception: Could not find Windows Principal for user (4259417)

When attempting to migrate from Lotus Notes to SharePoint Online if the user mapping utility is utilised then the following error may be generated in the trace logs:

System.Exception: Error mapping to field 'Cod Unidad'. ---> System.Exception: Could not find Windows Principal for user='<SharePoint Online Admin Account', email=''.
  at Quest.NSP.SharePoint.UserManager.GetFullNameForPrincipal(MappedIdentity user, SPPrincipalTypeWrapper principalType, String unid, String documentUrl)
   at Quest.NSP.SharePoint.UserManager.a(MappedIdentity A_0, SPPrincipalTypeWrapper A_1, String A_2, String A_3)
   at Quest.NSP.SharePoint.UserManager.a(MappedIdentity A_0, String A_1, String A_2, Boolean A_3)
   at Quest.NSP.SharePoint.UserManager.a(String A_0, String A_1, String A_2, String A_3, String A_4, UserMappingFailureSubstitution A_5, Boolean A_6, String A_7, Boolean A_8)
   at Quest.NSP.SharePoint.UserManager.GetUser(String name, String mappedName, String unid, String documentUrl, String context, UserMappingOptions userMappingOptions, Boolean ignoreMappingFailure)
   at Quest.NSP.SharePoint.UserManager.GetUserOrGroup(String name, String mappedName, String unid, String documentUrl, String context, UserMappingOptions userMappingOptions, Boolean useMappingFailureSubstitution, Boolean& isGroup, SPPrincipalTypeWrapper principalType)
   at Quest.NSP.SharePoint.SharePointFieldsWriter.a(Object A_0, String A_1, SharePointField A_2, Mapping A_3, List`1 A_4)