Flow - Assign opportunity owner based on Region

I've created a custom button that creates an opportunity from a case. It assigns the opportunity to the current user (and works absolutely fine) but I need to assign the opportunity to a sales person, based on multiple criteria (such as Region / Country ).

I've started by breaking it down, trying to assign the opportunity owner to one of two users, based on 'region = EMEAI'. It creates the opportunity but still assigns it to me.

This is the original flow that works fine: