App store
Unable to download apps. Requires to log in to iTunes
iPad Air, iPadOS 16
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Click on this link to find out how to sign in with your Apple ID --> Sign in with your Apple ID - Apple Support "After you log in, you can use the App Store, iCloud, iMessage, Apple Music, Apple TV+, and more."
Read this document if you can’t download or update apps on your iPhone or iPad --> If you can’t download or update apps on your iPhone or iPad - Apple Support
If the first 5 don't help, use the 6th.