Adding permissions to service accounts
You can manage your service accounts, discover newly added accounts, and set account notifications.
If needed, you can add permissions to a service account user. Service accounts are used to perform concurrent backups efficiently.
Click Services from the left navigation pane.
Click the Microsoft Office 365 link.
Click the + icon next to Manage Service Accounts.
Click Confirm to be redirected to the Microsoft Office 365 sign-in page to grant permissions.