Verification failed. An unknown error occurred.

Taking Apple id as an example, the solution to the unknown error caused by verification failure is:

1, check whether the account password is correct.

2. Check whether the mobile phone has a signal and whether the network is unblocked.

3. Check whether the information in the registered Apple ID account is complete.

AppleID is an authentication system launched by Apple for its iWork, iTunesStore, AppleStore and other products. As a full-featured account, AppleID allows users to access various resources of Apple. Because AppleID can be used for a variety of products and services provided by Apple, it can also be called Apple account, MobileMe account and. Mac account, iTunesStore account and iChat account. The AppleID can be used as login information for all Apple-related operations, including using iCloud to store content, downloading applications from the AppStore, and purchasing songs, movies and TV programs from the iTunesStore. AppleID uses an e-mail address. With the password, users can easily download, install and update software in the AppStore on iPhone.