itunesconnect test flight does not show recent builds even though simulators and USB works fine

问题

Four months ago, I built a demonstration react-native app and deployed it to test users via test flight. Everything worked fine.

Today, I decided to return to work on my app. I changed the version number to 10 and build number to 23 as shown in this image here:

Then I worked on the actual code. I've completely re-styled the interface and functionality. In XCode, I pressed Product>Clean, then I pushed it to my iOS simulators for iPhone 7, 8 and X. Everything worked perfectly. I connected some iphones via USB to my mac mini and deployed over the USB. Again everything worked perfectly on the actual phones.

So then I switched to Generic iOS Device:

Then I pressed Product>Clean, and then I pressed Product>Archive. The xcode Window>Organizer appeared. I then pressed a button to Upload to App Store.... I put in my password, the upload progress completed, and no errors occurred.

A few minutes later, I see my new build available in TestFlight. I've asked my QA people to download and test the build. They said that although the see the new Splash Screen I created (aka LaunchImage.storyboard), everything else about the app is the code from several months ago.

I went into Test Flight and I EXPIRED all past builds. I then went to xCode Window>Organizer and I deleted all past builds. I changed the build number. I then went to Product>Clean. Then I went to Product>Archive. Then I uploaded the app via Window>Organizer.

But again, all QA people who downloaded the next build/version still see the old app that I built 4 months ago, but with the latest splash image.

How do I use Test Flight to show people my latest build?