rman remove backups of archivelogs

Hi,

using this script to backup archivelogs:

run


{


allocate channel ch1 device type disk;




set limit channel ch1 kbytes 30097152;


sql 'ALTER SYSTEM ARCHIVE LOG CURRENT';


backup archivelog all not backed up 1 times format '/mnt/backup_synology/db-backup/%dRUIS/arch_%n%T_%p%U' ;


delete noprompt obsolete ;


select to_char(sysdate,'YYYY-MM-DD HH24:MI:SS') from dual;


}

Backup retention policy is set to redundancy 1.

I ran a full backup today then ran the script to backup the archivelogs. I expected (obsolete) backups of archivelogs from yesterday (and before) to be removed, but they are not.

Why?