Can't provide NuGet package source credentials to Azure Function

Question

I have an Azure function which has a dependency on a private package feed.

I am copying a nuget.config file to the app service which looks like this:

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <packageSources>
    <add key="MyPackageFeed" value="<package feed path>" />
  </packageSources>
  <packageSourceCredentials>
  <MyPackageFeed>
    <add key="Username" value="<first part of Hotmail address, before @ symbol>" />
    <add key="Password" value="<newly generated access token for username>" />
  </MyPackageFeed>
</packageSourceCredentials>
  <activePackageSource>
    <add key="All" value="(Aggregate source)" />
  </activePackageSource>
</configuration>

Note: I use the first part of my Hotmail account email address as this is the username I use to authenticate to the private feed elsewhere - Visual Studio etc.

This is what I am seeing in the Logs in the Azure function portal:

2016-10-05T11:57:16.974 Restoring packages.
2016-10-05T11:57:16.974 Starting NuGet restore
2016-10-05T11:57:18.381 Restoring packages for D:\home\site\wwwroot\HttpTriggerSqlDb\project.json...
2016-10-05T11:57:19.322 Unable to load the service index for source <path to feed>
2016-10-05T11:57:19.322 The parameter is incorrect.

If I change the Password key to ClearTextPassword as suggested by @brettsam, I now get the following:

2016-10-05T14:03:04.479 Please provide credentials for: <path to feed>
2016-10-05T14:03:05.097 Unable to load the service index for source <path to feed>
2016-10-05T14:03:05.097 Response status code does not indicate success: 401 (Unauthorized).
2016-10-05T14:03:05.142 UserName: Password:

Answer 1

Try using key="ClearTextPassword" (instead of key="Password"). If you use Password, NuGet assumes the value is encrypted and will try to decrypt it.

For example, I created a package feed in VSTS, then created a personal access token and used this:

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <packageSources>
    <add key="MyPrivateFeed" value="https://brettsam.pkgs.visualstudio.com/_packaging/stackoverflow/nuget/v3/index.json" />
  </packageSources>
  <activePackageSource>
    <add key="All" value="(Aggregate source)" />
  </activePackageSource>
  <packageSourceCredentials>
    <MyPrivateFeed>
      <add key="Username" value="brettsam" />
      <add key="ClearTextPassword" value="{PAT}" />
    </MyPrivateFeed>
  </packageSourceCredentials>
</configuration>