So that works thanks for your help

unusual that the code and logs seem to indicate that ut_dir etc.. are all correctly populated - you might want to look at that as a bug.

The arguments are being passed in except for label - I can confirm the directory is populated with content too.

Is your code expecting the arguments to be passed in after the --def flag, because that seems to be handled correctly anyway (according to the output)?

Script works perfectly fine when I ...

OS: Windows 8.1
Java: Java 8 v66 - 64bit build 1.8.0_66-b18
Client: qBitTorrent v3.3.1

My script on completion:
filebot.launcher.exe -script fn:amc --output "D:/" --action move --conflict skip -non-strict "ut_dir=%F" "ut_kind=multi" "ut_title=%N" "ut_label=%L" --def excludeList=amc.excludes ...