cannot connect to App store

Check your connection

Make sure that your device is connected to the Internet. Try using an Internet browser to connect to any website and see if it loads. If it doesn't, use another device on the same network to see if it can connect to any website. If no other devices can access the Internet, turn your Wi-Fi router off and then on again to reset it. If you still can’t connect to your Wi-Fi network, contact your Internet provider for more help. If only your first device can’t connect to the Internet, get help with Wi-Fi on your iPhone, iPad, or iPod touch.

If you use cellular service to connect to the Internet on your iPhone or iPad, make sure that you have cellular data turned on for the iTunes Store, App Store, and Apple Books: Go to Settings > Cellular, and turn on Cellular Data.

Check System Status

Visit the Apple System Status page to see if there are interruptions in service in your country or region.

Update your account

If you're not able to access the iTunes Store, App Store, or Book Store because you can't log in with your Apple ID, learn how to reset your Apple ID password. If you recently changed your Apple ID or password, you might have to sign out and sign back in. To sign in on your iOS device, go to Settings > [your photo] > iTunes & App Store. Tap your Apple ID, sign out, then tap Sign In to log in again. Learn how to sign out on your Mac, PC, or Apple TV.

If you're asked to verify your payment information, make sure that your payment method, first and last name, and billing address are correct and exactly match what's on file with your financial institution.

Update your software

Update to the latest versions of iOS, macOS, tvOS, iTunes, or your PC's operating system. Then try to connect to the iTunes Store, App Store, or Book Store again.

If you can't connect to the App Store, iTunes Store, or Apple Books ...

https://support.apple.com/en-in/HT201400