The link, Adjusting Windows Volume Feedback, to the Feedback Hub does work.
If it's your first time using a direct-to-Feedback-Hub link you will have a step in your default web browser where you'll have a dialog box asking if you want to allow the feedback hub to be automatically opened in the future for this kind of link, and it makes sense to answer that in the affirmative. It should open right after you do.
Brian - Windows 10, 64-Bit, Version 21H1, Build 19043
It is the function of creative men to perceive the relations between thoughts, or things, or forms of expression that may seem utterly different, and to be able to combine them into some new forms--the power to connect the seemingly unconnected.
~ William Plomer