when reading export logs, always look for the line starting with “error”. in your example it would be this:
[Error] You are running the 'restore' operation with an 'HTTP' source: http://teamcity.vvvv.org/guestAuth/app/nuget/v1/FeedService.svc/. NuGet requires HTTPS sources. To use an HTTP source, you must explicitly set 'allowInsecureConnections' to true in your NuGet.Config file. Refer to https://aka.ms/nuget-https-everywhere for more information.
so this sounds like you’d only need to fix the url from “http” to “https” in your nuget.config file.