Hello @Gujral, Gaurav,
Welcome to Microsoft Q&A forum.
If you want to update a published Visual Studio extension, you can follow this document: Update a published extension in Visual Studio Marketplace.
The error you got seems to appear when you were using Azure pipeline? Not very sure about the detailed reason, but the error message does mention that the extension with same name already exist. If you want to publish it via Azure pipeline, is it possible for you to try to remove the previous one and publish again with the fixed/updated one?
BTW, Visual Studio doesn't have a corresponding Linux version currently, and VS for Mac is different from VS(two different products), the same extension for Visual Studio may not support on different platforms.
Sincerely,
Tianyu
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