Apparently, newly registered users cannot use the WeChat web application. Trying to log in by scanning a QR-code gives the following message: (*)
For account security, newly registered WeChat accounts are unable to log in to Web WeChat. To use WeChat on a computer, use Windows WeChat or Mac WeChat at http://wechat.com
How long does it take for a new user to be able to use the web version?
(*) Note: the notification may be absent when trying to log in via a third party Google Chrome application (or other)