author kengaderdus ms.service active-directory-b2c ms.subservice B2C ms.topic include ms.date 10/16/2019 ms.author kengaderdus App registrations Under Manage, select Certificates & secrets. Select New client secret. Enter a description for the client secret in the Description box. For example, clientsecret1. Under Expires, select a duration for which the secret is valid, and then select Add. Record the secret's Value. You use this value for configuration in a later step. Applications (Legacy) Under API ACCESS, select Keys. Enter a description for the key in the Key description box. For example, clientsecret1. Select a validity Duration and then select Save. Record the key's VALUE. You use this value for configuration in a later step.