Hi @Wilson Au-Yeung ,
Welcome to Microsoft Q&A forum.
Does it work, if you add https://api.nuget.org/v3/index.json
as package source(Tools > Options > NuGet Package Manager > Package Sources)?
If the package source was set to https://api.nuget.org/v3/index.json
by default, then can other NuGet packages successfully be downloaded?
Best Regards,
Tianyu
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