Apple Store
I am not being able to sign in Apple media services. I tried to enter Apple store several times. Each time same error massage, “authentication failed” . What should I do?
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Do you have access to another WiFi network where you can try? That has worked for several people.
Try a forced restart.
If necessary
Do a backup and try a factory reset. Then restore from your backup.
Backup - Restore your device from an iCloud or iTunes backup