Apple Fitness on Family Share without Watch

According to this article Apple Fitness+ available to all iPhone users in 21 countries later this fall - Apple, I am supposed to be able to share my fitness plus subscription with my family members. However, I am unable to download the fitness app onto my wife's phone se (3rd gen) as it says "the app requires specific features not available on this device" I have family share enabled, and I am able to install it on my ipad, but, for convenience sake, she'd really love to have it available on her phone as well, and I am paying for the service. How do I correct this?