Todorovic Dragan

1) Log into the admin center with the admin account.
2) Click the “Outlook” tab in the top panel to enter OWA (Outlook Web App).
3) In the address bar, change the URL after “owa” to “ecp”. For example, if the URL of your Outlook Web App is https://server.outlook.com/owa/?exsvurl=1&ll-cc=1033&modurl=0&realm=domain.onmicrosoft.com, please change it to https://server.outlook.com/ecp/ to enter your Exchange admin center.
4) Click recipients on the left navigation.
5) Click mailbox on the right panel and double-click the display name of the mailbox you want to edit.
6) Click email address on the left navigation.
7) Click add icon to add an email address for this account.