As user-based license do not allow sign in on more than 2 devices at once, user should be automatically sign out from one of the previous devices while signing in the new device. For user using different devices or VMs frequently due to business needs getting a prompt and then sign out from previous device is more draining as well as time consuming. While signing in on new device, if it signs out user from previous device which had the oldest last launched, then signing in new device will be smoother for user.