Use AR output, and use the Incident ID as the match qualification. You can use either of the two forms.
If its not updating the records. Take one Incident ID, add that as qualification. and enable filter logs, then run the Job. You will find whats wrong from the logs.
I would recommend you always use the interface form and not the regular form (in cases where an interface exists).
As Parag mentioned, while importing try capturing API-SQL-Filter logs and read them to find out if there are any errors.