Providing Access Rights
Users responsible for Exchange items restore must be assigned a security role in Enterprise Manager, with the corresponding options enabled. For that, use the Microsoft Exchange items check box in the Add Role / Edit Role window when you configure user access rights. For more information, see Configuring Accounts and Roles.
The Items tab of Veeam Backup Enterprise Manager web UI will become available to these users after they log in to Enterprise Manager.
Next, go to the Configuration > Settings > Directory Account and specify Active Directory account that will be used to restore Exchange items. Make sure it has sufficient rights to access AD and mailboxes: Exchange Administrator rights and Administrator rights for all mailboxes are required.
To assign these rights, you can use Exchange impersonation or provide Full Access. For more information on the Exchange impersonation, see Microsoft Docs.
After specifying a user name and password, click Save.