How to add private nuget package resource in VS Code?

I'm using VS Code in Ubuntu Linux and I have private github package resource. I'm try to add paclage resource with private token generated from Github (https://docs.github.com/en/enterprise-server@3.9/authentication/keeping-your-account-and-data-secure/managing-your-personal-access-tokens).

I'm trying following in CLI terminal:

1. Execution error:
   

   dotnet nuget push --source "BackgroundJobs" --api-key anyapikey https://nuget.pkg.github.com/mypackage/index.json

2. Excuting but resource package not accessable during build
   

   dotnet nuget add source --username api-key --password <token> --store-password-in-clear-text --name NUGETGitHub "https://nuget.pkg.github.com/mypackage/index.json"