Three Month Free Fitness+ Trial Not Working for Some Users

Prior to the launch of Apple Fitness+, Apple introduced a promotion that's meant to give all customers who purchased an Apple Watch Series 6, SE, or Series 3 a free three month free trial of Fitness+.
While that free three month trial is meant to activate automatically and be available when first signing up for Fitness+, it appears that the extended trial is not working for some people.Based on complaints on the MacRumors forums, some customers who purchased a new Apple Watch in September are no