Apple ID security lockout with unknown trusted number

Smileandbehappy wrote:

My daughter Apple ID has a high security lock and comes up that it is a new device.

• What was formerly called Apple ID is now called Apple Account.
• An Apple Account cannot have a “high security lock”.
  • Might “high security lock” refer to some extra security on a device?
  • Lockdown Mode?
  • Activation Lock?

the trusted number is one we don’t recognise

What is the history of this device … from the time the factory sealed box was opened? Was it purchased at an Apple Store or from an Authorized Apple Retailer? What Apple Accounts used the device?