S3 backups missing but no errors

Hello, I’ve a S3 bucket configured on Virtualmin (I’m able to browse my buckets, so the credentials are OK).
After a backup to S3, I get the following verbose logs:

1 servers backed up successfully, 0 had errors.

Backup is complete. Final size was 19.34 MiB.

Deleting backups from prova/%Y-%m-%d.tar.gz in Amazon S3 bucket arn:aws:s3:::bucketname older than 30 days …

… failed to list S3 files :

but if I browse the bucket content on S3 AWS console, I don’t see the backup files.
How is it possible?
many thanks to everyone!

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