Hello @sangmin Kim,
Welcome to Microsoft Q&A forum.
You need to purchase the corresponding product key for activating corresponding versions of Visual Studio(For activating VS 2022, using the product key for VS 2022, for activating VS 2019, using the product key for VS 2019).
Not like product key, subscription usually supports activating earlier versions of Visual Studio(here are the details about the comparison of different subscriptions).
BTW, following is a screenshot for you to refer to:
Sincerely,
Tianyu
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