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Forza Rewards benefits are only available in the Xbox One version of Forza Horizon 2. This means that Xbox 360 players will not receive Forza Rewards credits or cars. In addition, progress in the 360 version of Forza Horizon 2 does not count towards your Forza Rewards Tier Level score. Only progress in the Xbox One version of Forza Horizon 2 will count towards your overall Forza Score (and Tier Level) in Forza Rewards.
Thanks for reading and I hope you continue to enjoy Forza Horizon 2.
Brian