Oracle XE 21c: cannot associate tablespace with user - oracle

Question

This is the first time that I am using Oracle.
I am using Oracle XE 21c, within a Docker container (gvenzl/oracle-xe:latest).
I create a tablespace.
I create a user, and I want to associate the previously create tablespace to the use (as default tablespable).
As SYSTEM, I create the tablespace CONCERTO_DATA. Everything is fine:
create TABLESPACE CONCERTO_DATA
datafile 'concerto_data.dbf' size 10M
autoextend on
next 512K
maxsize unlimited;
Then I create the user:
CREATE USER CONCERTO IDENTIFIED BY "password"
TEMPORARY TABLESPACE temp;
GRANT DBA, CREATE ANY TYPE TO CONCERTO;
GRANT EXECUTE ON DBMS_AQADM TO CONCERTO;
GRANT EXECUTE ON DBMS_AQ TO CONCERTO;
GRANT AQ_ADMINISTRATOR_ROLE TO CONCERTO;
GRANT CONNECT TO CONCERTO;
GRANT CREATE TYPE TO CONCERTO;
select username, default_tablespace from dba_users where username = 'CONCERTO';
Everything is fine. The default tablespace associated with the user CONCERTO is USERS.
I try to associate the previously created tablespace CONCERTO_DATA:
alter user CONCERTO default tablespace CONCERTO_DATA;
Then, a get a strange error:
[99999][65048] ORA-65048: erreur détectée lors du traitement de l'instruction DDL en cours dans la base de données pluggable XEPDB1
ORA-00959: le tablespace 'CONCERTO_DATA' n'existe pas
Position: 0
It says that the tablespace CONCERTO_DATA does not exist.
However, the table space exists:
select tablespace_name, con_id, STATUS from cdb_tablespaces WHERE TABLESPACE_NAME='CONCERTO_DATA';
Result is:
CONCERTO_DATA, 1, ONLINE
I have tried to associate the tablespace to the user during the user's creation:
CREATE USER CONCERTO IDENTIFIED BY "password"
DEFAULT TABLESPACE CONCERTO_DATA
TEMPORARY TABLESPACE temp;
But, I get the same error.
I have tried to create the tablespace using the user CONCERTO (instead of SYSTEM). But, I get the same error.
I think that the error is related to the container ID (COND_ID=1).
SELECT CON_ID, NAME FROM V$CONTAINERS;
Result:
1, CDB$ROOT
2, PDB$SEED
3, XEPDB1
I think that the container ID for the tablespace CONCERTO_DATA should be 3 (instead of 1). But I have no idea how to change it.

Answer 1

You probably created the TABLESPACE in the CDB because you forgot to
alter session set container = XEPDB1 ;