HUDs are client only. In your last shot it looks like you try to setup a widget for every player. That’s not how it works. A player needs to set up his own HUD widget. Think of it like the server doesn’t know about HUDs at all.
Make sure the create widget function is called on client and use the “getplayercontroller” node to get a reference to the local player controller.
If you really just want to display a message to each player you can use this big-*** notifications. I don’t know the exact name of the node but I think it includes the name “notification”. You might something if you look around here in the ARK forum.