Failed to call Adwords api example

Hello,

I's using Adwords API Guide to call API examples in .NET Library, but get an exception:

Customer passed in an invalid token in the header.. (Error: QuotaCheckError.INVALID_TOKEN_HEADER, FieldPath: , Trigger: "MY_DEVELOPER TOKEN(combination of symbols")Google.Api.Ads.AdWords.Lib.AdWordsApiException (AdWordsApiException: One or more AdWords API errors have occurred.

Steps I did:

1. Created manager production account, got Developer Token.

2. Created Test Manager account. While logged in test manager account, created client account using "Account -> new Adwords Account", got CLIENT_ID (10 numbers). Added test campaigns to client account.

3. While logged in  test manager account, created Credentials ( client_id, client_secret) in Google API Console Credentials page.

4. Used these credentials to generate Auth2RefreshToken in Auth2TokenGenerator.exe. I was logged in to test manager account when clicked " Manage your AdWords campaigns -> Allow". Got Auth2RefreshToken .

This is a part of my app.config file:

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <configSections>
    <section name="AdWordsApi" type="System.Configuration.DictionarySectionHandler" />
  </configSections>
  <AdWordsApi>
   

    <!-- Settings related to SOAP logging. -->
    <add key="MaskCredentials" value="true"/>
    <add key="EnableSoapExtension" value="true"/>

    <!-- Settings related to general library behaviour. -->

    <!-- Use this key to automatically retry a call that failed due to a
         recoverable error like expired credentials. -->
    <!-- <add key="RetryCount" value="1" /> -->

    <!-- Set the service timeout in milliseconds. -->
    <!-- <add key="Timeout" value="100000" /> -->

    <!-- Use this key to enable or disable gzip compression in SOAP requests.-->
    <add key="EnableGzipCompression" value="true" />

    <!-- Set this flag to true to include the list of client library utilities
         that your code uses in the user agent string.-->
    <add key="IncludeUtilitiesInUserAgent" value="true" />

    <!-- Proxy settings for library. -->
    <add key="ProxyServer" value="" />
    <add key="ProxyUser" value="" />
    <add key="ProxyPassword" value="" />
    <add key="ProxyDomain" value="" />

    <!-- Settings specific to AdWords API.-->

     <add key="UserAgent" value="MY_COMPANY_NAME" />

    <!-- See https://developers.google.com/adwords/api/docs/signingup for
         instructions on signing up for a developer token.-->
    <add key="DeveloperToken" value="MY_DEVELOPER_TOKEN_FROM STEP 1" />

    <add key="ClientCustomerId" value="CLIENT CUSTOMER ID FROM STEP 2" />

    <!-- Use the following settings to skip the report header and summary rows
         when downloading a report in CSV, TSV or their gzipped formats. -->
    <add key="SkipReportHeader" value="false" />
    <add key="SkipReportSummary" value="false" />
    <add key="SkipColumnHeader" value="false" />

    <!-- <add key="IncludeZeroImpressions" value="true" /> -->

    <!-- <add key="UseRawEnumValues" value="true" /> -->

    <!-- Settings specific to use OAuth2 as authentication mechanism. You could
         run Common\Util\OAuth2TokenGenerator.cs to generate this section of the
         config file.
    -->

    <add key='OAuth2ClientId' value="OAuth2 CLIENT ID FROM STEP 3' />
    <add key='OAuth2ClientSecret' value='"OAuth2CLIENT SECRET FROM STEP 3' />

   

    <add key="OAuth2Mode" value="APPLICATION" />
        <add key='OAuth2RefreshToken' value='REFRESH TOKEN FROM STEP 4' />

    <!-- Optional: Specify an OAuth2 redirect url if you are building a
         web application and implementing OAuth2 web flow in your application.
    -->
    <!-- <add key="OAuth2RedirectUri" value="" /> -->

    <!--
    <add key="OAuth2Mode" value="SERVICE_ACCOUNT" />
    <add key="OAuth2PrnEmail" value="INSERT_OAUTH2_USER_EMAIL_HERE" />
    <add key="OAuth2SecretsJsonPath" value="INSERT_OAUTH2_SECRETS_JSON_FILE_PATH_HERE" />
    -->

    <!-- The following keys are deprecated, use OAuth2SecretsJsonPath instead.-->
    <!--
    <add key="OAuth2ServiceAccountEmail"
        value="INSERT_OAUTH2_SERVICE_ACCOUNT_EMAIL_HERE" />
    <add key="OAuth2JwtCertificatePath"
        value="INSERT_OAUTH2_JWT_CERTIFICATE_PATH_HERE" />
    <add key="OAuth2JwtCertificatePassword"
        value="INSERT_OAUTH2_JWT_CERTIFICATE_PASSWORD_HERE" />
    -->
  </AdWordsApi>

</configuration>

Please, tell me what I'm doing wrong. Also I have a question. Should I connect somehow manager production account and manager test account?

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