Open your Resolve Project

Go to the Media Tab

Navigate to where your audio mix is located on your hard drive

and right click it and choose > Add into Media Pool


Then go to the Edit Tab 

Right click on your final timeline and choose

>Duplicate Timeline


Rename it - with stereo mix

Select all your audio clips and choose to delete them by 

pressing the delete key on your keyboard

Right click on track A1 and choose > Delete Empty Tracks

Then drag the stereo mix down to A1 and match up to the 

head of your timeline


Go to the Fairlight tab

Look at sync and make sure it's good

Also look at the levels and make sure they are playing back in stereo