Well, I asked the AI and the problem was quickly found.
Answer
You’re very close, but there’s a tiny little typo that the FRITZ!Box Config Parser doesn’t like at all 😄
Problem:
The goose quotes “…” are typographical (i.e. smart quotes) instead of straight ASCII characters ".
I simply copied the line from the forum and didn’t notice the error.
So always pay attention to the little things 😆