LinkedIn is committed to account safety and security, and provides features to help ensure your account is always secure. One such feature is two-step verification. Enabling two-step verification can greatly reduce unauthorized access to most accounts from new or unknown computers or devices.
As an additional layer of security, LinkedIn may prompt you to verify your sign in through your LinkedIn app when a new device is detected instead of sending a pin code through SMS or an authenticator app. You will receive a push notification prompt on your signed-in device after entering your login credentials into the new or unknown device.