Xiaomi Redmi Quicksupport works only one time
I installed quicksupport and its add-on on a Xiaomi Redmi 9T. I could connect to it successfully over the internet from a PC one time. After that, the next connection only allowed me to view the screen, and no remote control. Furthermore, viewing only should show the the screen touches but I don't get that either.
How do I make this work reliably?