Downloading from toggo.de, issues getting the key

[Roemer]

Hello all
I have my own downloader which uses getwvkeys to lookup the correct keys but I struggle with getting keys from toggo.de
For example this video: https://www.toggo.de/monster-high-pty536/folge/der-geheime-tausch-1-vep16071
The licence server seems to be https://widevine.rtl.de/index/license (according to the browser dev-tools) but when trying a lookup via getwvkeys or cdrm-project, it always fails with an 403 error. What am I doing wrong? I even tried using some random German proxy servers.
Many thanks for your help.

[aqzs]

Here is the key :

a19527255d0a02e2928689249843d0c7:86ad1edc545070fcc0957a6952154b11

Download command :

N_m3u8DL-RE --key a19527255d0a02e2928689249843d0c7:86ad1edc545070fcc0957a6952154b11 'https://vodvmsusoaws-cf.superrtl.de/sms/srtl/ASV16721/1-1-1-1.ism/v1.mpd' -M mkv -mt --check-segments-count False --save-name monster-high-pty536

Download link : https://gofile.io/d/03tBFb
X-Forwarded-For in the header bypass georestriction.

[Roemer]

I did some downloads with allhell3 GUI which works great as well but is a manual process with the browser.
I now actually tried your suggestion and added the appropriate header to getwvkeys and it works flawlessly. Whooo, automated downloads again Many thanks.