title: OfflineConversionError UNAUTHORIZED_USER
body: <p>I am working on a Google AdWords integration built on .NET, which was developed some time ago for API v201409. That version of the API has not been retired and I am now trying to migrate to the latest (v201506).
  I have updated the Nuget package and it builds fine.</p>
  
  <p>The account that I use to upload conversions is a manager account, with around 50 client accounts being managed by it.</p>
  
  <p>When trying to upload conversions to some of the client accounts I am getting OfflineConversionError.UNAUTHORIZED_USER errors.</p>
  
  <p>When I check the setup on the Google AdWords website everything looks fine. Each client account has the manager account set in the Account access settings.</p>
  
  <p>I have used the ManagedCustomerService API to retrieve a list of client accounts that are managed by the manager account and it returns all accounts, including those that throw the error.</p>
  
  <p>All refresh/access tokens appear to be working fine.</p>
  
  <p>Has anyone experienced similar problems?</p>