A message from Microsoft confirms: “The iOS TestFlight preview is only available in the US, UK, and Canada at this time.
“Unlike the Xbox Game Streaming (Preview) app on Android, this iOS TestFlight preview is for Project xCloud only and does not include Xbox Console Streaming (Preview) at this time.
“Due to App Store policy, the iOS TestFlight preview will begin with one game, Halo: The Master Chief Collection.
“As is standard with iOS TestFlight builds, we’re starting with a very limited preview audience. Up to 10,000 testers will be invited into the preview, but we anticipate that demand will exceed our capacity and we will be unable to accommodate all applicants. We’ll distribute invitations to participate on a first-come, first-served basis.
“Because of how iOS TestFlight works, those who are accepted into the iOS TestFlight preview may not necessarily participate for the full duration of the preview. As noted earlier, there are limited spaces available, so for testing purposes we may need to cycle through registrants in order to best utilize the available testing audience.