I ran into an user migration issue with Quest Migration Manager (QMM) when merging accounts using an input file. Instead of merging the user account, the QMM was creating a duplicate account in the target domain.
The input file was in the following format:
The issues was due to the file Encoding type. We were using UTF-8 encoding type. Based on my testing, the Encoding type must be ANSI. I believe it is because of the TAB character in UTF-8 encoding.
So if you are planning to use an input file for the migration using Quest Migration Manager (QMM), make sure the Encoding type is ANSI.