Register your app with Microsoft
You will need a work/school account or a Microsoft account. In having that,
1. Go to the Microsoft Application Registration Portal.
2. When prompted, sign in with your account credentials.
3. Find My applications and click Add an app.
4. Enter your app's name and click Create application.
After you've completed these steps, an application ID is created for your app and displayed on your new app's properties page.
Take note that this should be sufficient for using Workato's prebuilt Outlook and OneDrive connectors. If you are looking to use Workato's HTTP or SDK connector you may check this article for additional information: For HTTP/SDK Security Reminders