This isnt a question but a helpful tip.
Just got the index S2 scale and it was a pain to set up my partner up on it.
First off, you have to be connected on the app.
Secondly, im not sure if this was part of the issue but after i was having problems setting her up i changed her privacy settings which was set to only me to connections.
When i sent her the invite she was notifed but it didnt take her to the notifications when she clicked on the link.
You actually have to click on notifications even though there isnt an indication there is any
After entering her name and editing the information it displayed some error messages and therefore didnt allow me to finish the set up.
Hit cancel set up and go to devices
It should display the scale even though you didnt finish setting it up.
I added her name there finished editing the info. After that she was able to weigh herself and it recognized it was her.
Hope this helps.