Create a client secret for the Azure app for SharePoint Online.
In the navigation pane, click Certificates & secrets.
The Certificates & secrets page appears.
Click New client secret.
The Add a client secret dialog box appears.
Enter a description, and then select Never expire.
Copy and paste the client secret value in a document that you can access later.
You will enter this value in the Command Center when you complete the Office 365 guided setup.