Hi @Sergio Topete ,
Welcome to Microsoft Q&A!
Starting with NuGet.Server 3.0.0, the URL for pushing packages was change to http://<domain>/nuget. Prior to the 3.0.0 release, the push URL was >http://<domain>/api/v2/package.
Please check the config and path by referring to: Adding packages to the feed externally.
By the way, for questions about NuGet.Server, it is recommended to report on: https://github.com/nuget/NuGetGallery/issues.
Sincerely,
Anna
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