Apply Damage Function and HUD

Hello,
I have a simple damage system for my simulator. When a character enters a fire, smoke etc and overlaps a collider the Apply Damage is activate in the PlayerCharacter bp and substracts 0.1 each time the character enters an damage causing area. The problem is that while I can see the actual value of the Health variable drop normally, the HUD progress bar does not perceive the change. When I tested a simple key press health substraction it worked perfeclty.
Is there an issue with the cooperation of apply damage function and HUDs progress bars? Do I need to create a simpler damage implementation system I have previously created (when a character collides with a fire an event is tirggered in player character and the health drops.
Please help and thank you in advance!

Did you bind a progress bar value to function that takes health as param?

Do you mean this one?
The OldMale is one of my characters (I also need a way to apply the same HUD to different characters) and the Health is the variable I created in this character bp.