I have a problem on my team server (F1team): it is not possible to see the names of the players above the cars as in following image

It is usually possible to activate/deactivate this functionnality with ² (or an other key depeding on your computer and your game settings) but on F1team server, it only works for people in spectator mode

The server (login : f1tserver, usual name : F1team~Grand Prix) is on pack pack Stadium-F1 in Stadium environment.