Are bEnableClickEvents and bEnableMouseOverEvents set to true? Also make sure your gameviewport isn’t taking focus but your UI, use this function if needed FSlateApplication::SetUserFocus | Unreal Engine Documentation
Are bEnableClickEvents and bEnableMouseOverEvents set to true? Also make sure your gameviewport isn’t taking focus but your UI, use this function if needed FSlateApplication::SetUserFocus | Unreal Engine Documentation