Mongolian not accepted on my computer

[FiableDotBiz]

Hello.

I read on Wikipedia that espeak-ng reads Mongolian, but on my computer, with version 1.51.1 (Fedora workstation 38, Gnome 44.1), I get:

$ espeak-ng -v mn гарах
Error: The specified espeak-ng voice does not exist.

What should I do? Thank you in advance.

[jaacoppi]

Monogolian is not supported. Can't find any references to it in source code.