GijungKim

To join the Android beta (takes ~2 min, I have dumbed this down for gamers as much as possible):

Join the beta testers group (https://groups.google.com/g/teamfit-tactics-beta) 
(if that doesn't work, just email anything to teamfit-tactics-beta+subscribe@googlegroups.com)

Wait a minute for it to sync, then opt in and download here
https://play.google.com/apps/testing/com.teamfittactics