Forza (and other Xbox games?) seems to treat DLC on a shared console like the family car: Anybody can borrow the keys to use it, but the DMV registration is always in one person’s name. The DLC asset can be used by shared accounts without multiple purchases, but the DLC benefits are only available to the account that purchased the DLC. Sharing ability may be affected by whether the owner/shared account is the one set to “This is my home console” so experiment with that. Contact Xbox Support about license transfer. See: