1. Check if the App Store is down. From time to time Apple suffers from a server outage. It could be that the App Store is down and nobody can access it. Read more here: Is the App Store down?

Concerning your iPhone, try disconnecting from the Wi-Fi and reconnecting. Conversely, you can also try resetting your router. I would also recommend enabling and disabling Airplane Mode and see if Check Apple’s System Status Page It’s possible the App Store isn’t working on your iPhone because of an issue with Apple’s servers. Check out Apple’s System Status page and make sure the dots are green, especially the first one next to App Store.
Check Apple’s System Status for App Store. Whenever Apple’s servers face an outage, a number of features and services (i.e iCloud backup, iCloud Drive, App Store, Siri, etc.) are affected. So, if App Store is still not working on your device, it would be apt to check the system status of the App Store.
Update your software On your Mac, install the latest version of macOS. If you can't install the latest version of macOS, try to install OS X El Capitan 10.11. On your Windows PC, install the latest version of Windows and download the latest version of iTunes. Update your iPhone, iPad, or iPod touch to the latest version of iOS or iPadOS.
What to Know If you can’t connect to the App Store, check your network and data settings. If you can't download apps, check your iPhone storage and your Screen Time Settings. To enable in-app purchases, go to Screen Time > Content & Privacy Restrictions > iTunes & App Store Purchases > In-app Purchases > Allow.
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why is my app store not working