I am developing an outlook plugin.I want use one drive API's in it.I easily got the client Id and client secret for using API's for one drive personal accounts.But, when I registered my application for one drive business API's in azure active directory, it created only a client Id for me, but didn't create any client secret.I chose native app while registering, as my app is a native app.I can't authenticate the user without the client secret.Please let me know , how to get the client secret?Thanks in advance.
Native clients don't have any secrets associated to them - given that they are meant to run on devices, it is assumed that they would not be able to protect a secret. Native clients use the clientID for indicating the client app, but the authentication is always done by involving a user identity in the process. If you pick any of the native client samples in http://github.com/azureadsamples you will see how the clientid is enough to trigger user auth.
Create Application and click on keys. Add some description and expiry as required and Click Save. Key will be auto generated. Make sure you copy and save the Key else it will be hidden.
Once you move off the page after saving your information, you cannot get the client secret from the Azure website. You need to create a new secret and when you click save, immediately go and copy the secret and store it securely. This is the only time it is available from the Azure website.
来源：https://stackoverflow.com/questions/32607302/how-to-get-client-secret-from-azure-active-directory-for-native-app-for-using-on