Hello oooVeeoo,
i have tested it in a new project. Maybe this will help you?
In my new HUD i created first the widget and took the reference from it inside the hud and added it to my viewport
Then i created another Widget with a simple textblock and added one test event
After thath in my Character BP i Casted to my “NewHUD” and got my reference Variable “UI_REF”. Object i got directly from the PlayerController
Now if i start my game the new Text will appear via Event call. I hope this will help you 