I have a Xiaomi Redmi 3S and another 3 more Xiaomi Redmi devices with my relatives. I have tried using TeamViewer QuickSupport but no luck. Installation is good, shows the Partner ID and even the request is coming. But after the allowing connection the TeamViewer on my Linux machine (Ubuntu 18.04 LTS) shows "Ready to connect" and at the mobile side it shows a progress indicator for a few seconds and shows the home screen back again. I can see the notifications, Session Stared and Ended. Is QS hardware specific or OS Specific?
The 4 devices are:
1. Xiaomi Redmi 3S Prime (Has custom ROM called "Pixel Experience" based on Android Pie)
2. Xiaomi MI A2 Lite (Has default OS "Android One")
3. Xiaomi Redmi 5A (Has custom ROM called "Pixel Experience" based on Android Pie)
4. Xiaomi Redmi 5A (Default OS "MIUI9")
In none of the devices QS is working.