you don’t need any of that extra stuff, I use the remote mouse app which turns your phone into a wireless keyboard and touchpad. Works for me and it is free.
This does kind of jide the issue though - why is the functionality not in the companion app?
It is the age old zwift approach - something goes wrong, is broken or never worked properly, someone finds a workaround and so no need to actually fix the problem.
Happens time and time again.