Text-to-speech problem with speechsynthesizer

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C#

speech

text-to-speech

I am trying to create a simple text-to-speech application using C# and `System.Speech.Synthesis`. The issue is that I want this application to work with the Greek language. So what I attempted to do is this:

SpeechSynthesizer synthesizer = new SpeechSynthesizer
    {
    Volume = 100,
    Rate = -2
    };
    
    synthesizer.SpeakAsync("Γειά σου κόσμε!");

Of course this does not work, since the result of this code is that the voice pronounces every letter individually.

What I have tried:

After a lot of googling, I tried to install and use espeak and the Greek voice that comes with it like this:

synthesizer.SelectVoice("eSpeak-el-gr");

The result was exactly the same - the voice said every letter individually, and not the whole word. Is there a way to fix this issue, so that `SpeechSynthesizer` will say all the Greek words and not just the letters of them ?