Hey, I found a mysterious behavior:
It is importand, that your Browser (Chrome) is closed.
Within 1Password for Windows 10 Beta I click on "Manage Vault" within the vault list.
Chrome and a new tab "my.1password.eu" will opened.
I am asked to enter my master password and the 2FA key. I do that.
Now I can see the vault details
But: At the same time a further new tab will opened and I have to re-enter my master password and the 2FA Key.
From Chrome I get a notification: 1Password Authentication required.
I hope you understand what I mean and can reproduce it