Forza Horizon 5 loyalty rewards were distributed to all players at a later date.
Playground Games has officially announced that Loyalty Rewards in Forza Horizon 5 will be distributed and updated in one day. However, all other auto gifts are available and have already been given to qualified players.
With the Loyalty Rewards, all loyal players who played the predecessor of Forza Horizon 5 will receive some special vehicles in the game. Further information is available here.