Hi I have noticed the following issue. If you allow only the M2-Cup configuration when you start a dedicated server it's not possible to join the race with the M2-Cup car. The server booted the player with the message "Configured Vehicle Class Does Not Pass Filter". If you try the same with the M2-CS class everything works like expected. If you selcect the M2-CS configuration it's possible to join. If you select the M2-Cup version you get booted with the correct message. If both classes are selected it's possible to join with both vehicle configurations. The issue is reproduceable with several servers all the time.
