select data from mgmt$ views not working from other user

SQL> create user testusr identified by xxxxxx;

User created.

SQL> grant create session to testusr;

Grant succeeded.

SQL> grant select on sysman.mgmt$target to testusr;

Grant succeeded.

SQL> connect testusr

Enter password:

Connected.

SQL> select count(1) from sysman.mgmt$target;

   COUNT(1)

----------

          0

Elapsed: 00:00:00.09

SQL> connect / as sysdba

Connected.

SQL> select count(1) from sysman.mgmt$target;

   COUNT(1)

----------

       2046

Elapsed: 00:00:00.07

SQL>