If your CBH device Windows has just updated following an extended period when it hasn't updated, when you attempt to log in to Live Desktop or any other RDP (e.g. Capita Housing, Mitel phones) instead of being asked to enter your email address and password to log in, you may see a box asking you to enter your PIN. Alternatively, f you have one of the newer Acer laptops, you may be asked for your fingerprint (if you've set this up).
To work round this, rather than enter your PIN, you click on the "More Choices" option (towards bottom left of box) and select "Use a different account". Then you enter your email address and password and login as normal (including authentication). Your account will be stored but you'll always have to click on "More Choices", then select your stored account and enter your password.