By default in Unreal the PAWN preset does not block the Visibility Channel (The NPC Examples were set to block it). So for the player you will need to set the Collision preset to CUSTOM and then check the Block Visibility box if you are wanting to do a Visibility trace. There are many different types of traces you can do.
That being said you will probably want to do your trace abit differently for dealing damage then how the ARPGIS interact trace is setup as it’s designed simply for interaction with objects.
There should be plenty of information on the Unreal wiki about raycasts/traces in blueprint that will help you understand better what way is best for your needs.