To specify the credentials of an existing account that has the ApplicationImpersonation and Mailbox Search roles:
Open the Kaspersky Security for Microsoft Office 365 Management Console.
In the left part of the page, select the Account section.
Click the Continue button.
Select the Manually option and click Continue.
Enter the credentials for the Service Account that was created earlier, and click the Submit button.
The application validates the specified credentials and configures a Service Account. Operation progress and its result will be displayed on the same page.