A Samsung Note 8 and a ZTE Axon 7. I had TimeTrack open on both devices, logged into the same account, stopped all timers on all devices, forced synced each device, then started a timer on the Note 8. I then left both devices alone. 20 minutes later, the new, running timer has not shown up on the Axon 7. If I force sync the Axon 7, the running timer shows up.