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Open a Command Prompt window as an administrator.
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Set the following Oracle parameters (replace <ORACLE_HOME> with the path of your Oracle home directory:
set ORACLE_HOME=<ORACLE_HOME>
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Type sqlplus /nolog and press ENTER to launch a SQL Plus session.
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Connect to the database as SYS:
connect sys/<sys_password>@<PDB instance> as sysdba
Ensure that you are connected to PDB and not to CDB.
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Select username from sys.all_users au where au.Username like 'APEX%';
You will see the following three users:
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APEX_200100
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APEX_PUBLIC_USER
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APEX_INSTANCE_ADMIN_USER
If Apex is installed, make sure that the version is 20.1.0.00.13.
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