Create a guest account (if you do not have one already) using an email that is not your UAS email. 2. You cannot use two different windows or tabs of the same browser and you should close the browser hotmail, yahoo account etc. Create.
You can create a local account for them but Windows also offers a Guest account which is more limited as compare to local account. In Guest.
You will need an MS account. There is no way around that. Some features on are locked until you sign-in to an MS account. Just create How do I enable a guest account to print?.
Create a yahoo guest account in windows - triple double