Hi Steve Thanks for your response. I've read the documentation and for the client part I followed the Microsoft documentation: https://learn.microsoft.com/en-us/nuget/create-packages/symbol-packages-snupkg After some testing, I've found the problem: I had to add /v3/index.json to the URL. Now the package and the symbols are pushed to the server. The ProGet UI shows the correct URL under API endpoint URL:. I'm not sure why my build script was using the URL without v3. Maybe it was different in an older version of ProGet or I just made a mistake somewhere? Interesting is that pushing "worked" when using the URL without v3 and v2 API disabled for the feed. Maybe the client NuGet client contains some logic to only push the snupkg file when it detects a v3 source?

Hi Steve Thanks for your answer. I saw this in the doc and thought it will use v3 https://learn.microsoft.com/en-us/nuget/api/search-query-service-resource It is possible to search for packages available on a package source using the V3 API. The resource used for searching is the SearchQueryService resource found in the service index. In this case, sorry for the question and please forget it^^