Hi @HyeonJung Park ,
Welcome to Microsoft Q&A!
Which version of Visual Studio are you using? Have you checked for your network?
Please update your VS to the latest version and create a new project to check if it disappears.
If you have any anti-virus software, please temporarily disable it.
Maybe it is a temporary certificate prompt, you can click on ‘Accept’ and check that it works normally.
Sincerely,
Anna
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