Using Zyte with Selenium?

proxy = Selenium::WebDriver::Proxy.new(http: "API_KEY:@proxy.crawlera.com:8011")
cap = Selenium::WebDriver::Remote::Capabilities.chrome(proxy: proxy)
driver = Selenium::WebDriver.for(:chrome, capabilities: cap)
driver.navigate.to("http://httpbin.org/ip")
puts "content: #{driver.page_source}"
driver.close

 But it is returning my ip instead of the proxy IP

If I use another proxy (without authentication) I get the proper proxy IP:

proxy = Selenium::WebDriver::Proxy.new(http: "185.235.41.85:80")
cap = Selenium::WebDriver::Remote::Capabilities.chrome(proxy: proxy)
driver = Selenium::WebDriver.for(:chrome, capabilities: cap)
driver.navigate.to("http://httpbin.org/ip")
puts "content: #{driver.page_source}"
driver.close

 Result: 

{
  "origin": "185.235.41.85"
}