playWaveFile: ERROR_OK but not playing anything

Hello, I use playWaveFile in the onTextMessageEvent like this:

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int ts3plugin_onTextMessageEvent(uint64 serverConnectionHandlerID, anyID targetMode, anyID toID, anyID fromID, const char* fromName, const char* fromUniqueIdentifier, const char* message, int ffIgnored) {
        printf("PLUGIN: onTextMessageEvent %llu %d %d %s %s %d\n", (long long unsigned int)serverConnectionHandlerID, targetMode, fromID, fromName, message, ffIgnored);
        const unsigned int Return = ts3Functions.playWaveFile(serverConnectionHandlerID, message);

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playWaveFile returns ERROR_OK but I cannot hear anything being played back.

Some idea what I can do to archieve a file being broadcasted to all users in my channel?

playWaveFile: ERROR_OK but not playing anything