I'm still not able to use the sound feature. It worked a few hours ago, but now it doesn't.
Edit: Now I'm getting this message:
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Messenger Plus!
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Das Eigene Emotion Sounds Feature ist im Augenblick deaktiviert.
Der Server könnte z.Z. gewartet werden, bitte später erneut versuchen.
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OK
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It says it's currently disabled etc. Looks like it's being worked on it.