FGA AUDITING does not record audit

hello i dont know why my fga auditing is not working

my code

EXEC DBMS_FGA.ADD_POLICY(OBJECT_SCHEMA=>'PLSQL',OBJECT_NAME=>'REGIONS',AUDIT_COLUMN=>'REGION_NAME',POLICY_NAME=>'REGPOL',ENABLE=>TRUE,STATEMENT_TYPES=>'SELECT');

and then i disconnect and login with another account and do a select

 CONN PLSQL/asdzxcSELECT REGION_NAME FROM REGIONSREGION_NAME-----------------------------------asdasdasdasdasdasdqweasdEastern AfricaMiddle AfricaNorthern AfricaSouthern AfricaWestern AfricaCaribbeanCentral America

after that i login back to sysdba and issue

SELECT * FROM DBA_FGA_AUDIT_TRAILno rows selected

why no row in dba_fga_audit_trail? i also tried to make other user and grant access to plsql.regions and no audit data is recorded