UMTS module is not recognized

Hello,

I wanted to test today whether I can go online with the UMTS module and have found that this is not recognized.
The following settings I have already tried but this has brought no success.
Is there anything else that I have to install or set?

System:
TUXEDO Aura 15
Kernel: 5.16.5-arch1-1 x86_64 bits: 64 compiler: gcc v: 11.1.0
Desktop: GNOME 41.3 tk: GTK 3.24.31 wm: gnome-shell dm: GDM 41.3
Distro: EndeavourOS base: Arch Linux

Bus 003 Device 003: ID 12d1:15bb Huawei Technologies Co., Ltd. ME936 LTE/HSDPA+ 4G modem

https://wiki.archlinux.org/title/Mobile_broadband_modem#Using_mmcli

mmcli -L
error: couldn't find the ModemManager process in the bus

https://archlinux.org/packages/?name=modemmanager

is already installed:

2 extra/modemmanager 1.18.4-1 (1.1 MiB 5.3 MiB) (Installiert)
    Mobile broadband modem management service
1 extra/libmm-glib 1.18.4-1 (703.5 KiB 12.4 MiB) (Installiert)
    ModemManager library

Does the device show up with

lsusb

Did you enable and start ModemManager.service

Edit:

systemctl enable ModemManager.service 
systemctl start ModemManager.service

Edit2: You can also check

systemctl status ModemManager.service

Then try

mmcli -L
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