Due to the limitations of mobile platforms, authentication to QQ Music is only available in our desktop app.
In order to use QQ Music, please download our Desktop app. Then in the Profile sections, enter your license code, that you've got over email. (or in mobile app you can check your license code in Profile section).
Then in the desktop app, select QQ Music as your importer and log in to the service. After doing that, you can access QQ Music and create new sync on all the devices, macOS, Windows, Linux, iOS and Android.
We are sorry for the trouble, and we are already working on improving this flow.