Skype for Business mobile clients not connecting?

Question

Skype

Good day to all.
Recently deployed Standart SfB 2015.
Desktop clients work without problems. What's inside what's outside.
Checked Lync Connectivity Analyzer, Skype for Business Connectivity, found no issues.
However, when I try to connect from Android, Windows phone clients, I get the error "Can't sign in. Please check your account information and try signing in again."
WAP and Edge installed.
Help deal with the problem.

Answer 1

For mobile clients to work, you need a reverse proxy