How to grant "grant create session" privilege?

You can grant system privileges with or without the admin option. The default being without admin option.

GRANT CREATE SESSION TO username

or with admin option:

GRANT CREATE SESSION TO username WITH ADMIN OPTION

The Grantee with the ADMIN OPTION can grant and revoke privileges to other users

You would use the WITH ADMIN OPTION option in the GRANT statement

GRANT CREATE SESSION TO <<username>> WITH ADMIN OPTION

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