Discover how to configure the mobile app: Mobile app setup
On Apache and PHP server you may need add on .htaccess file the following lines:
RewriteEngine On
RewriteCond %{HTTP:Authorization} ^(.*)
RewriteRule .* - [e=HTTP_AUTHORIZATION:%1]
Than logout and login on the mobile app.
This will fix the issue that when operator typing from the mobile app no typing indicator is showed to the visitor.