Why i'm getting access denied?

yaml
# catalog.yml
example_data:
  type: PartitionedDataSet
  dataset: pandas.ParquetDataSet
  credentials: dev_s3
  path: s3://bucket/path/to/folder
  filename_suffix: "_part.parquet"

yaml
# credentials.yml
dev_s3:
  client_kwargs:
    aws_access_key_id: xxxx
    aws_secret_access_key: xxx