I'm using my Garmin Index Smart Scale with Version 3.10.0.0
Last success measurement was a week ago (Saturday) and before that working flawless.
This week we tried a couple of weightins as well today and every time the X message on the upper right corner will show, name and numbers seem OK but do not transfer or better say they are not assigned and add it to our accounts automatically, they do show if you go to Health Stats and Weight they are there and have to be add it manually.
Maybe it has to do with this week Garmin Connect app (iOS) update Version 4.32 because before that it was working fine the scale without X errors and assigning weights to users/accounts.
Also not necessarily related but I think it has to do with Garmin Connect app (iOS) update since this update the communication between Garmin Connect app Apple iOS Activity app in particular Calorie count has been semi lost (added after a workout but then if you open Garmin Connect again it will remove the calories from the workout on the Apple Activity Calorie.