unable to enable passwordless login

I need to enable passwordless login on a Windows 10 PC o that I can use zoom rooms. I have found KB0065706 and am trying to follow the steps in it, but the "Users must enter a user name and password to use this computer" option is not visable So I'm going to settings - accounts - sign-in options. There is no "Require Windows Hello sign-in for Microsoft accounts"

Am I missing something?