ORA-65096: invalid common user or role name

SQL> CREATE USER remote_clone_user IDENTIFIED BY remote_clone_user;
create user remote_clone_user identified by remote_clone_user
            *
ERROR at line 1:
ORA-65096: invalid common user or role name


SQL> alter session set "_ORACLE_SCRIPT"=true;


SQL> CREATE USER remote_clone_user IDENTIFIED BY remote_clone_user;


SQL> grant create session,create pluggable database to remote_clone_user;