Navigate to Start → Active Directory Users and Computers on any domain controller in the root domain of the forest where Microsoft Exchange 2019, 2016, 2013 or 2010 is installed.
In the left pane, navigate to <domain_name> → Microsoft Exchange Security Groups.
On the right, locate the Organization Management group and double-click it.
In the Organization Management Properties dialog that opens, select the Members tab and click Add.
NOTE: If for some reason you do not want this account to belong to the Organization Management group, you can add it to the Records Management group in the same way. The Records Management group is less powerful, and accounts belonging to it have fewer rights and permissions.