App not found in App Store by some users, but found by others

Solution 1:

Actually, there are several possible reasons:

• Not available in the user's country
• The AppStore take some time to deliver an app update to everyone (should be available within 24 hours)
• Not available for the user's device (32bits, iPad or iPhone..)
• Phased Releases option used in AppStore Connect

This list is certainly not exhaustive*

- How to browse iPhone App on iPad:

http://osxdaily.com/2017/10/18/download-iphone-apps-onto-ipad/

- 32 bits apps aren't showing up in the AppStore anymore:

https://www.gizmodo.com.au/2017/06/32-bit-apps-arent-showing-up-in-the-app-store-but-dont-panic-yet/