Very strange. Last year during Covid I believe Ancestry Library was made available to everyone online for free. I was told that prior to that it was freely available through libraries. I have never subscribed to Ancestry. I did create a trial login
I have had one or two issues over the month in hitting the login page but find if I go back a page and try again it works. I did have a login for Ancestry UK for a trial period but that was over a year ago.
Could I suggest you follow a link, and go back when you get to the login page and then try going forward again to see what happens.