No client license is available. Either all licenses are in use, or licenses and stations in control center are misallocated
This message means you are either 
    
    1) out of licenses
    
    log in as admin, and go to:
    Home > configure > product licenses > count all client
    licenses.
    
    Then Report center tab, hit "Active users". 
    Count the number of users, vs. the number of licenses you have.
    
    if you have more users than license count, you are hitting the
    license limit. Either purchase more licenses, or have someone log
    off.
    
    
 
    
    
    
    2) If not #1 above. then that workstation is not allocated in the
    control center.
    
    Pls see here to allocate a workstation:
https://support.stopware.com/portal/en/kb/articles/enable-the-enterprise-control-center-in-passagepoint