Our rule of thumb, when dealing with an issue we’ve escalated to MS support, is that if they suggest that you take the matter to Microsoft’s “uservoice” page you know that the ticket has been closed beyond any hope of reopening. If they just tell you that they are marking the ticket as closed or inactive you can fix that by leaning on your rep; but if uservoice gets mentioned…game over man, game over.
Now that they are killing off the uservoice pages I assume that the same will be true of the “feedback hub app”.