In order to answer this question, we need to provide you with a basic understanding of how the App Stores of various platforms work. Each one is like a walled garden where the owner of the app store (ie: Apple, Google, Amazon, etc) wants to get a piece of the pie. So, anytime they process signups, they take a commission (usually 30% of the price of the membership!). If we were to allow you to insert a coupon code in the app, then that would cut dramatically into the funds we receive from you and it would force us to raise our prices.
Instead, to keep costs low for our members, we only allow coupon codes to be used on the web where Fearless is the owner of its own garden. But don’t worry, once you sign up on the web with your coupon code, you can still log in and use all the apps, it just means that you can’t sign up on the apps if you’re using a coupon code.
Hope that makes sense and that you understand why coupon codes only work on the web.