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Have you ever had it on another machine?
I cannot find any Microsoft supplied language option for Telugu for text to speech, though under Windows 10 it does exist for the Windows interface itself.
This is a function of the synth you are using so you'd need one that includes Telugu among the languages it can read. If you had it before, then you need to check out what configuration was in use where you did have it before.
Brian - Windows 10, 64-Bit, Version 21H2, Build 19044
The real art of conversation is not only to say the right thing in the right place but to leave unsaid the wrong thing at the tempting moment.
~ Dorothy Nevill