I posted a while back about the same problem. I have been using the library edition of ancestry at home during the pandemic, and successfully generated quite a few free-to-view image links using Deb's procedure, along with Greg Clarke's Ancestry Citation Builder app. And then the 'Share' link on the Tools menu suddenly disappeared, and I could find no solution or workaround. And then somebody posted an unrelated link in G2G that allows Pennsylvania residents to access certain data bases of the PA State Archives on ancestry for free. I tried that, and was able to access some records, and wah-lah, the sharing link was back when I was not logged in via the library account.
That whole scenario makes me wonder if ancestry has some sort of a throttle on the use of the sharing feature, and if an account holder generates too many free-to-view links in a given period of time, he is cut off from further use. That's purely a guess, and I have no additional data to support it, and no clue if it's a reasonable explanation. I would think, though, at the price of their subscriptions it's pretty shabby if they are giving that treatment to a paid subscriber.
Edited to add: I was too quick on the trigger. Also intended to suggest, Thressa, why don't you report the problem to ancestry tech support and see what they tell you? If you get an answer, I'd love to know!