iOS - old versions of app getting installed from the App Store

Question

We just had an app update get approved in the App Store today. However, on some devices, when we download the app, even after completely deleting it first, it is installing the

Answer 1

I don't know about TestFlight. But, I had this issue when my new version of app gets to "Ready for Sale". Spent long time searching for a solution for this issue.

Surprisingly about an hour it got resolved by itself. So, I advice you to be patient it works by itself after a while.