On some devices, TeamViewer Quicksupport is only supporting the screen sharing and no interaction with the screen can be made. For that reason, we usually use ANYDESK to connect to your mobile device. It is already installed on our mobile devices but in case it has been deleted or uninstalled by error you can download it from here (Android) :
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Anydesk has published a new version 7.0.0 on the playstore
CAUTION this new version requires the Add On aosp2-1 (below) to work properly
The previous AddOn version (Aosp) does not enable anymore to have the total remote control over the device (only screen sharing : keyboard and clic forbidden)
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