Creation mongodb backups using Kubernetes Service Account for access to S3 bucket

Hello All. I would to like to configure mongodb backups to create them on aws s3 bucket. I have created a special serviceaccount, role in iam and granted permission for access to the s3 bucket where I plan to store the backups(Configuring a Kubernetes service account to assume an IAM role - Amazon EKS). I configured backups in PerconaServerMongoDB and pointed the serviceaccount and arn of iam role. But backup-agent was able to connect to s3. It was getting 403 error.
Is it possible to configure access to s3 by ServiceAccount?