I found a solution - I did not specify the address of the service (

here is a working code example:

basket = s3-infra.loc/
path = "s3-artifacts-test/proj_path"
task = Task.init(
        project_name=project_name,
        task_name=task_name,
        reuse_last_task_id=False,
        output_uri='s3://{basket}{path}',
    )