Move negut v2 API to negut v3 api

I am trying to install some nuget packages but every time i get this Feedback

Severity Code Description Project File Line Suppression StateError Failed to fetch results from V2 feed at 'https://www.nuget.org/FindPackagesById()?id='Microsoft.Bcl.Build'&semVerLevel=2.0.0' with following message : Response status code does not indicate success: 404 (Not Found).Response status code does not indicate success: 404 (Not Found).

can anyone help..my project delivery window is closing very fast.

I have change nuget configuration fromhttps://www.nuget.org/api/v2/tohttps://api.nuget.org/v3/index.json

Am expecting the package microsoft.net.http to be added into the project