How can I audit actions done by my schema within my schema using Oracle Unified Auditing?

I want to be able to audit specific actions within my own schema (such as DDL, inserts, updates, anything I feel like). I am on Oracle 19C with mixed mode for auditing.

I have a user "SPLUNK", which has the following table:

CREATE TABLE BAT (  ID INT GENERATED ALWAYS AS IDENTITY NOT NULL , NAME VARCHAR2(20) );

I create and enable an audit policy to test any changes to the table structure as follows:

CREATE AUDIT POLICY ALTER_TABLE_POLICY_SPL ACTIONS ALTER ON SPLUNK.BAT;AUDIT POLICY ALTER_TABLE_POLICY_SPL;

If I, as the SPLUNK user, run the following SQL statement:

ALTER TABLE BAT ADD (AGE INT );

Then run this statement:

select * from unified_audit_trailORDER BY EVENT_TIMESTAMP DESC;

My alter statement is NOT included in the audit results. However, if I create another user TESTUSER, give ALTER and SELECT privileges to SPLUNK.BAT:

GRANT ALTER ON SPLUNK.BAT TO TESTUSER;GRANT SELECT ON SPLUNK.BAT TO TESTUSER;

Then I run this, as the TESTUSER:

ALTER TABLE SPLUNK.BAT ADD (FAVORITENUM INT );

My alter statement IS included in the unified_audit_trail. What gives? Specifically, why is my alter statement for the TESTUSER user audited but not for the SPLUNK user?

More importantly, how could I change my audit policy to audit the alter table action on SPLUNK.BAT by ALL users, including the SPLUNK user?