How to Configure Boundary for https

Trying to setup https for boundary on AwS with a listener on 443 and domain ACM to a target group forwarding to the controllers on port 9200.

my issue at the moment, is that boundary will work with http, but once i try to access it via https, i get a 502 returned.

Has anyone got Boundary to work with https via an application load balancer on aws? or can point me to the correct documentation