Open the System Profile and ensure that the Operations Mode includes hot desks by setting it to Hot Desks or Both. See here
Setting up the login form
BOOKER provides for a number of authentication methods. The basic one is "Internal Door Tablet".
To enable login using Internal Door Tablet users click on "Set login form for ". The link will show the current IP address or DNS name you have used to open the server. We recommend that you create sub domains in DNS and enable these for: