ORA-01017: invalid username/password; logon denied on Pluggable database - oracle12c

Question

I created a local user under a pluggable database. I granted some privileges required to open and use it. I check the username and the password. Still it keep saying invalid username/password.
Step that I take:
1. alter session set container = xxxxpdb
2. alter pluggable database xxxpdb open
3. SQL> alter user #### identified by #### container = current;
User altered. -----i did this one to make sure that i have a correct password
4. connect ###/####XXXXpdb;
ERROR:
ORA-01017: invalid username/password; logon denied
5. Then tried to connect to it this way
$ sqlplus ###/####xxxxpdb
ERROR:
ORA-01017: invalid username/password; logon denied
I am new to container database. I would appreciate any detailed explanation! Thank you.

Answer 1

Based on error message, it looks like the user doesn't exist in PDB.
For an existing user you may get a relevant error related to privilege. For example:
SQL> conn <existing_uname_without_required_privileges>/<upass>#<pdb_name>
ERROR:
ORA-01045: user <uname> lacks CREATE SESSION privilege; logon denied
Warning: You are no longer connected to ORACLE.
SQL>
For a non-existing user, the error you have observed will be returned:
SQL> conn <non_existing_user>/<upass>#<pdb_name>
ERROR:
ORA-01017: invalid username/password; logon denied
SQL>
This OraDoc Page provides the local user related information in CDB.