How to assign a manager to an user and view an user’s report from manager’s mailbox from EAC?

Step 1: Sign into Office 365 admin portal via https://portal.office.com

Step 2: Click on Admin from the left pane and navigate to Exchange admin center.

Step 3: Click on the Recipients and switch to Mailboxes tab.

Step 4: Double-click on the user to whom a manager must be assigned.

Step 5: Switch to Organization tab from the left pane.

Step 6: Under Manager field click Browse and select an account to be manager.

Step 7: Click Save.