Mixing 2 Mono Input to Stereo Output

Hello,
Though the setup process isn't necessarily intuitive, this is a pretty common workflow and I think we should be able to get it working for you.

Under Input 1, create an Audio Selector
For Type, select Track
In the Track field, enter: 1,2
(Leave the rest of the audio selector settings at default settings

Then, in the output, select the audio track
Under Audio Source, select Audio Selector 1
Under Coding Mode, select 2.0 - L,R (Stereo)

By default, this will map Track 1 on the input to the Left channel of the output, and Track 2 of the input to the Right channel of the output.

Here's some documentation that should help --
More about Audio Tracks and Audio Selectors: https://docs.aws.amazon.com/mediaconvert/latest/ug/more-about-audio-tracks-selectors.html

Let me know if that helps, if you run into any issues, or if you have any follow questions. Thanks!
-Jared

Thank you very much.
Had tried adding tracks as 1,2 but did not leave settings alone so couldn't get the result I wanted.
Now it worked!