Login issues with Up Studio Beta

I have an UpBox+ and I’ve tried installing Up Studio for it - seems to work well on a mac, but on win11, well, it all seems to work until you click the “login” button to login to Up. The button isn’t greyed out or anything and the username and password is the same as I’m using for Up Studio 2, but nothing at all happens when I press it, so I’m left back with using the old one. Any ideas?

6 months later and exactly the same problem on Win10. For clarity I’m using UP_Studio_3.3.1_beta and a Cetus2.