Hello @Devdutt Gore ,
welcome to Microsoft Q&A forum.
Could you please share the document which you referred to with me to check?
Besides, have you checked this document: Create your first Microsoft Teams app using Node.js and downloaded then installed Git, Node,js and NPM?
Please also try to use Package Manager Console to write NPM commands(Tools > NuGet Package Manager > Package Manager Console).
Best Regards,
Tianyu
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