Edit the storage VM: click Storage > storage VMs, click the storage VM, click Settings and then click under S3.

Add a group: select Groups, then select Add.

Enter a group name and select from a list of users.

You can select an existing group policy or add one now, or you can add a policy later.

Create an S3 group:
vserver object-store-server group create -vserver svm_name -name group_name -users user_name\(s\) [-policies policy_names] [-comment text\]
The -policies option can be omitted in configurations with only one bucket in an object store; the group name can be added to the bucket policy.
The -policies option can be added later with the vserver object-store-server group modify command after object storage server policies are created.