Cannot perform Windows authentication with Oracle DB

I am trying to connect to my Oracle DB with Windows authentication, and it just doesn't seem to work - Whatever I do I keep getting "ORA-01017: invalid username/password; logon denied". I installed Oracle DB version 21c, and upon that created a new windows user as the Oracle Home User. My global DB name is orcl.ad11.siemens.net, and the PDB is orclpdb. I've created a new listener with the following configuration in **listener.ora**: LISTENER_2 = (DESCRIPTION_LIST = (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1522)) (ADDRESS = (PROTOCOL = IPC)(KEY = PNPKEY)))) SID_LIST_LISTENER_2 = (SID_LIST = (SID_DESC = (GLOBAL_DBNAME = ORCLPDB.AD11.SIEMENS.NET) (ORACLE_HOME = C:\Oracle\OraDB21c\WINDOWS.X64_213000_db_home) (SID_NAME = ORCLPDB))) And added an alias in **tnsnames.ora**: LISTENER_2 = (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1522)) (CONNECT_DATA = (SERVICE_NAME = ORCLPDB.AD11.SIEMENS.NET))) When I execute "lsnrctl status LISTENER_2", I get: STATUS of the LISTENER ------------------------ Alias LISTENER_2 Version TNSLSNR for 64-bit Windows: Version 21.0.0.0.0 - Production Start Date 05-DEC-2024 15:18:31 Uptime 0 days 0 hr. 1 min. 0 sec Trace Level admin Security ON: Local OS Authentication SNMP OFF Listener Parameter File C:\Oracle\OraDB21c\WINDOWS.X64_213000_db_home\network\admin\listener.ora Listener Log File C:\Oracle\OraDB21c\diag\tnslsnr\\listener_2\alert\log.xml Listener Trace File C:\Oracle\OraDB21c\diag\tnslsnr\\listener_2\trace\ora_23584_28284.trc Listening Endpoints Summary... (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=127.0.0.1)(PORT=1522))) (DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(PIPENAME=\\.\pipe\PNPKEYipc))) (DESCRIPTION=(ADDRESS=(PROTOCOL=tcps)(HOST=.ad11.siemens.net)(PORT=5500))(Security=(my_wallet_directory=C:\ORACLE\ORADB21C\admin\orcl\xdb_wallet))(Presentation=HTTP)(Session=RAW)) Services Summary... Service "75b0d2bd17c4485c998c967244b4515d.ad11.siemens.net" has 1 instance(s). Instance "orcl", status READY, has 2 handler(s) for this service... Service "ORCLPDB.AD11.SIEMENS.NET" has 2 instance(s). Instance "ORCLPDB", status UNKNOWN, has 1 handler(s) for this service... Instance "orcl", status READY, has 2 handler(s) for this service... Service "bc74b627f47a416ab26784e660b5c7b2.ad11.siemens.net" has 1 instance(s). Instance "orcl", status READY, has 2 handler(s) for this service... Service "orcl.ad11.siemens.net" has 1 instance(s). Instance "orcl", status READY, has 2 handler(s) for this service... Service "orclXDB.ad11.siemens.net" has 1 instance(s). Instance "orcl", status READY, has 1 handler(s) for this service... The command completed successfully I noticed the status of ORCLPDB is UNKNOWN but I have no idea why - guess it might be something to consider as the source of the problem. Additionally, I added the following line to **sqlnet.ora**: SQLNET.AUTHENTICATION_SERVICES = (NTS) And I also granted my current windows user with the required privileges, and it's verified by the fact that: ALTER SESSION SET CONTAINER = ORCLPDB; SELECT USERNAME, AUTHENTICATION_TYPE FROM DBA_USERS WHERE AUTHENTICATION_TYPE = 'EXTERNAL'; Returns my current windows user. I use the following command to connect: sqlplus /@LISTENER_2 And tried many other ways as well, but keep getting that ORA-01017. Does anyone have a clue what is the problem here and how can I fix it?