@Mayuresh Gawai Welcome to Microsoft Q&A Forum, Thank you for posting your query here!
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The Not Found
error using ARM template deployment is explained in this article:
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Could you please check if you have provided the right BotService resource properties as explained in this article?
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If the above suggestion doesn't help, Please feel free to share the ARM template here, so that I can test the same at my end. Awaiting your reply.