Linux known Joystick not seen by MAVProxy module joystick or findjoy

(Working on Linux Mint Ulyana that’s based on Ubuntu Focal)

Problem:
Using my Taranis QX7 via USB as Joystick is working as it should. The only thing I had to do is to prepare a Taranis.yml with the correct match: in /home/willy/.mavproxy/joysticks

When I try to use my Orange USB Dongle, it’s been recognized by Linux, but not by the joystick module or the findjoy tool in MAVProxy.

Taranis QX7 via USB-Kabel

$> cat /proc/bus/input/devices
I: Bus=0003 Vendor=0483 Product=5710 Version=0111
N: Name=“FrSky FrSky Taranis Joystick”
P: Phys=usb-0000:00:14.0-3/input0
S: Sysfs=/devices/pci0000:00/0000:00:14.0/usb3/3-3/3-3:1.0/0003:0483:5710.0005/input/input21
U: Uniq=00000000001B
H: Handlers=event17 js0
B: PROP=0
B: EV=1b
B: KEY=ff 0 0 0 0 0 0 ffff000000000000 0 0 0 0
B: ABS=7f
B: MSC=10

Orange-Empfänger FrSky D8 am USB

$> cat /proc/bus/input/devices
I: Bus=0003 Vendor=0451 Product=16a5 Version=0111
N: Name=“OrangeRX FrSky USB HID”
P: Phys=usb-0000:00:14.0-3/input0
S: Sysfs=/devices/pci0000:00/0000:00:14.0/usb3/3-3/3-3:1.0/0003:0451:16A5.0004/input/input20
U: Uniq=
H: Handlers=event17 js0
B: PROP=0
B: EV=9
B: ABS=ff

$> jstest /dev/input/js0
Driver version is 2.1.0.
Joystick (OrangeRX FrSky USB HID) has 8 axes (X, Y, Z, Rx, Ry, Rz, Throttle, Rudder)
and 0 buttons ().
Testing … (interrupt to exit)
Axes: 0: 5405 1: 0 2: 0 3: 0 4: 0 5: 32767 6: 32767 7:-32767
-----> the axes are moving correctly in Linux

$> python -m MAVProxy.modules.mavproxy_joystick.findjoy
pygame 2.1.2 (SDL 2.0.16, Python 3.8.10)
Hello from the pygame community. Contribute - pygame wiki
This script will help you identify axis, button, hat, and
ball ids on your joystick in order to create new joystick
definitions for the mavproxy_joystick module.

Available joysticks:

Select a joystick (L to list, Q to quit)
-----> no joystick found in MAVProxy

I’ve got stuck here - could anybody give me a hint how to proceed?