Not able to produce sound other than english

[Fathimathrisvana]

I'am trying to produce the Malayalam audio
I installed https://github.com/espeak-ng/espeak-ng/releases/download/1.51/espeak-ng-X64.msi
checked whether it supporting Malayalam using espeak-ng --voices it shows
ml --/M Malayalam dra\ml
along with the list of languages support

import subprocess

def text_to_speech_malayalam(text, output_file):
espeak_path = r"c:\Program Files\eSpeak NG\espeak-ng.exe"
subprocess.run([espeak_path, '-v', 'ml', '-w', output_file, text])

text_to_speech_malayalam("ഇന്നലെ ഞാൻ നെയ്യാർ അണക്കെട്ടു കണ്ടു കാറിൽ മടങ്ങി വരികയായിരുന്നു", 'output.wav')
code is working with an empty output voice, I reinstalled the espeak, tried with other languages too, but the working is same, I also tried using cmd such as espeak-ng -v ml "hai hello",that is also working only for English.
Why the audio is not able to generate for other languages?