c# - .NET v4.8: updating the Microsoft.Configuration.ConfigurationBuilders to version 3.0 does not work - Stack Overflow

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I am working on a .NET 4.8 application, I updated the packages Microsoft.Configuration.ConfigurationBuilders (Environment, Json, UserSecrets) from version 2.0 to 3.0. I have also updated my app.config file to reflect the latest version, shown here:

<configBuilders>
    <builders>
      <add name="Environment" type="Microsoft.Configuration.ConfigurationBuilders.EnvironmentConfigBuilder, Microsoft.Configuration.ConfigurationBuilders.Environment, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
      <add name="Secrets" 
           userSecretsFile="./App_Data/secrets.xml" 
           mode="Greedy" 
           type="Microsoft.Configuration.ConfigurationBuilders.UserSecretsConfigBuilder, Microsoft.Configuration.ConfigurationBuilders.UserSecrets, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>      
    </builders>
  </configBuilders>

The structure of the secrets.xml file is given below:

<root>
<secrets ver="1.0">
    <secret name="App:UserKey" value="Hello World"/>
</secrets>
</root>

Before the update, when the version was 2.0. I was able to read the value from the secrets.xml file specified in the app.config key userSecretsFile:

var userKey = System.Configuration.ConfigurationManager.AppSettings["App:UserKey"];

After the update from version 2 to 3, this code does not work anymore and returns an empty string. I read the update guide but none of it provides troubleshooting guidance. I tried to update the path from ./App_Data/secrets.xml to ~/App_Data/secrets.xml for testing even then I get an empty string in the variable userKey. I also tried updating the structure of the secrets.xml file to the one given below but still no success

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
    <appSettings>
        <add key="App:UserKey" value="Hello World" />
    </appSettings>
</configuration>

It seems that there could be an issue with how the UserSecrets package reads the path of the userSecretsFile in version 2 vs version 3. If I switch back to version 2 everything works as expected.

I also read this Stackoverflow post which talks about the same problem and I am doing things as suggested in the old posts but not sure what else needs to be added/updated.

Update:

I looked inside the path \bin\Debug\net48\win7-x86\App_Data for the secrets/xml file and it wasn't there so in visual studio I right clicked the file and updated the property Copy to Output Directory from Do not copy to Copy if newer and it worked but I didn't had to do this in the previous version? Is this like an undocumented step that needs to happen for version 3?

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