aax2mp3-easy not working for German Audible accounts

[tolwin]

I just installed aax2mp3-easy on Debian 10. Installation seems to work fine (no errors reported).
But I cannot decode my aax file.

I think this is because I have a German Audible account and the aax2mp3-easy is logging into audible.com.
I think adding the following lines to audible-activation-master/audible-activator.py would fix the problem:

elif lang == "de":
login_url = login_url.replace('.com', ".de")
base_url = base_url.replace('.com', ".de")

With this "change" aax2mp3-easy does log into my German Audible account....but somehow the tool then exits with the error message: "2021-01-19 16:43:15+0100 ERROR File NOT Found: 9e4b7803".

I am not sure what to do in that case.