Hi Centurion,
Welcome to the group.
That is an unusual way to do a mod.
Are you sure that the button has been glued? Could it be spillage from a drink with sugar in? I know, difficult to spill drink in that position but could be "sticky" finger or spray. I would try removing the switch and then soaking the switch only in water. Dry it out really well before reconnecting it.
Only a guess but I remember having a car detailed a few years back and landed up with sticky buttons that the cleaning fluid they used had dried jamming the buttons, took a while to clean them out.
Good luck with it
__________________
Ray at Wigan Pier
2014 A8L D4 4.0TFSI Gold (Sticker says "Beige") Can't leave you in a black smoke cloud anymore..
In progress, Nothing left to do.
Gone 2004 A8 D3 3.0 TDI. Ebony Pearl Black (with little bits of other colours and glitter)