Connection to Oracle DB 19c fails when listener is set to the host IP address
Maybe add something like this to your listener.ora:
SID_LIST_LISTENER =
  (SID_LIST =
    (SID_DESC =
      (GLOBAL_DBNAME = POLA)
      (ORACLE_HOME= C:\Polarbear\WINDOWS.X64_193000_db_home)
      (SID_NAME = POLA)
    )
  )

You might run this query to verify your global name:
select global_name from global_name;

SID should be
select INSTANCE_NAME from v$instance;

Bobby