Looks like RAM digital key is only available for iPhone users. On the website there is no mention of android users when it comes to digital key. I am an android user, and might have to switch to iPhone lol. I can't say that I don't care for this feature, but it's not the baggiest deal.
"Leave keys and key fobs behindāsimply add an available digital key to a compatible iPhoneĀ® or Apple WatchĀ® to access and start your truck without removing the smartphone from your pocket. Digital keys can be shared with other compatible AppleĀ® devices, while the owner retains full control over access."