Hi there @Aarick, thank you for sharing your experiencing with us. As you already know the Amazon Fire OS s built on an Android layer, so many functionalities will be similar to a regular Android device. I got one of the newest models of the Kindle Fire HD and it does not work the Fitbit app from the App gallery; primary because this devices are not listed as compatible.
What I do, which is not official and I do not recommend to do neither. is that I have to install some google play services that enable to install Google play apps. from here the Kindle sot of becomes an android device in theory, but its functionality regarding the Fitbit app was not the best. Since the syncing was sporadic and I'm not sure of this, but the battery was draining faster than normal.
So let me know how it goes for you!
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