I signed up for the paid plan. It had been working seamlessly, but unfortunately now there is a problem with it and using YubiKeys. I contacted support who were unfortunately not a lot of help. I have now moved over to an alternative password manager as not having a seamless experience when using something so fundamental as YubiKeys is a dealbreaker for me!

In fairness, this is my only complaint with the product and I had been satisfied with it to the point when a product update caused this issue.