Synchronize contacts on all devices for a Ring username

Issue generated from Tuleap's migration script. Originally submitted by: Óvári (ovari)

* Environment:
Multiple computers with: Linux Mint 18.2 Cinnamon 64-bit; Ring Gaston Miron - Beta 2 built on 2017-07-18 21:18:18 UTC
Android 4.4 Smartphone with Ring

* Reproduce steps:
Contacts have been added and accepted on the Linux computer.
Both the computer and smartphone had Ring signed in.

* Expected result:
Contacts should show on the Android smartphone
Contact should be up-to-date and synchronized across all devices.

* Actual result:
The Android smartphone says "Contact request sent". The contacts on the Android smartphone seem to be not yet accepted and hence can not call.