Fix this need the role below:
GRANT aq_administrator_role TO db_user
There is laso other grant commands may need:
E.g:
GRANT EXECUTE ON SYS.DBMS_AQ TO db_user;
GRANT aq_user_role TO tenuser1;
GRANT EXECUTE ON dbms_aqadm TO db_user;
GRANT EXECUTE ON dbms_aq TO db_user;
GRANT EXECUTE ON dbms_aqin TO db_user;