By any chance, has your account been registered on the German site? I had a similar problem a few years ago. I had no choice but to create a new account on the French site, which in any case had solved my problem.

Then maybe for you, you just need to go to settings and change the language from German to French.

If a solution is found, I'd be delighted to hear about it.

Thank you very much

I think you can only change the language via the Alexa app under Settings