@Amit Pradeepnath Mishra Welcome to Microsoft Q&A Forum, Thank you for posting your query here!
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This docs says that the Romanian language is supported.
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I was able to invoke the translator v3.0 api and it worked fine for the Romanian language. See below:
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Could you please frame the request URI correctly in the query string (from
and to
fields) in the postman as shown above ?
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Awaiting your reply.