I’ve used it very recently and it still works (if you’re in the uk, anyway).
I cancelled my ancestry auto renewal then when it had lapsed ( you show as a guest- all your trees etc are still there though) you log in to ancestry then open another page and use the link on this second page. You seem to need ancestry to be open already for the link to work. Try that if you haven’t. It won’t work if you have a current subscription ..fingers crossed