Can't sign in with Apple is. Verification failed an unknown error occured
Can't sign in with my iPhone 8. Apple ID and password says verification failed unknown error occurred.
iPhone 8, iOS 14
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Some things you can try. Do you have access to another WiFi network where you can try? That has worked for several people.
Try a restart.
Restart your iPhone, iPad, or iPod touch
Try a forced restart.
If necessary
Do a backup and try a factory reset. Then restore from your backup.
Restore - If you see an error when you update or restore your iPhone, iPad, or iPod
Backup - Restore your device from an iCloud or iTunes backup.