Azure Artifact Nuget package debugging issue

I'm using Azure Pipeline to build and publish NuGet packages to the Azure Artifact feed. The pipeline includes the Publish Symbols task as below:

- task: PublishSymbols@2  inputs:    SearchPattern: '**/bin/**/*.pdb'    SymbolServerType: 'TeamServices'

However, when installing the package into the sample console app I can not debug the package (the body of the methods is not visible).

I'm using C# .NET Core 3.1Pipeline Type: YAMLUsed this article to config the Visual Studiohttps://docs.microsoft.com/en-us/azure/devops/artifacts/symbols/setting-up-github-sourcelinking?view=azure-devops