You can add one or more Azure apps to a OneDrive for Business Application.
From the navigation pane, go to Protect > Applications > Office 365.
The Office 365 apps page appears.
Click the OneDrive for Business app for which you want to change the global administrator account.
The app page appears.
In the Azure apps section, complete the following steps:
Click Add app.
The Add Azure app dialog box appears.
Perform one of the following tasks to add an Azure app:
To add an app using the global administrator credentials, click Yes. Enter the new global administrator account email address and password, and then click Save.
To add an app manually, click No. Enter the Application ID and Application key value, and then click Save.