worked this time, after executing below.

SQL> CONN sys@cdb1 AS SYSDBA

DECLARE
  l_passwd VARCHAR2(40);
BEGIN
  l_passwd := DBMS_RANDOM.string('a',10) || DBMS_RANDOM.string('x',10) || '1#';
  -- Remove CONTAINER=ALL for non-CDB environments.
  EXECUTE IMMEDIATE 'ALTER USER anonymous IDENTIFIED BY ' || l_passwd || ' ACCOUNT UNLOCK CONTAINER=ALL';
END;
/

Install logs,

Thank you for installing Oracle Application Express 20.1.0.00.13

Oracle Application Express is installed in the APEX_200100 schema.

The structure of the link to the Application Express administration services is as follows:
http://host:port/pls/apex/apex_admin (Oracle HTTP Server with mod_plsql)
http://host:port/apex/apex_admin (Oracle XML DB HTTP listener with the embedded PL/SQL gateway)
http://host:port/apex/apex_admin (Oracle REST Data Services)

The structure of the link to the Application Express development interface is as follows:
http://host:port/pls/apex (Oracle HTTP Server with mod_plsql)
http://host:port/apex (Oracle XML DB HTTP listener with the embedded PL/SQL gateway)
http://host:port/apex (Oracle REST Data Services)

timing for: Phase 3 (Switch)
Elapsed: 00:00:17.56
timing for: Complete Installation
Elapsed: 00:10:45.03

PL/SQL procedure successfully completed.

1 row selected.

...null1.sql