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Cannot install ElasticSearchPremium via composer on Magento Cloud Platform

Hello everybody,

I'm cannot install ElasticSearchPremium module via composer on Magento Cloud Platform. COMPOSER_AUTH enviroment configured like this:

When push composer.json to the cloud platform, I've got the error message:

  1. [Composer\Downloader\TransportException]                                                               
  2.         W:   The '' URL required authentication.  
  3.         W:   You must be using the interactive console to authenticate    
How can I resolve it?
Thanks and best regards.