diff --git a/src/frostfs_testlib/s3/aws_cli_client.py b/src/frostfs_testlib/s3/aws_cli_client.py
index ae9254c..8169afe 100644
--- a/src/frostfs_testlib/s3/aws_cli_client.py
+++ b/src/frostfs_testlib/s3/aws_cli_client.py
@@ -975,7 +975,7 @@ class AwsCliClient(S3ClientWrapper):
         response = self._to_json(output)
 
         assert response.get("Policy"), f"Expected Policy in response:\n{response}"
-        assert response["Policy"].get("PolicyName") == policy_name, f"PolicyName should be equal to {policy_name}"
+        assert response["Policy"].get("Arn") == policy_arn, f"PolicyArn should be equal to {policy_arn}"
 
         return response
 
diff --git a/src/frostfs_testlib/s3/boto3_client.py b/src/frostfs_testlib/s3/boto3_client.py
index 5686b78..a644a6f 100644
--- a/src/frostfs_testlib/s3/boto3_client.py
+++ b/src/frostfs_testlib/s3/boto3_client.py
@@ -776,7 +776,7 @@ class Boto3ClientWrapper(S3ClientWrapper):
     def iam_get_policy(self, policy_arn: str) -> dict:
         response = self.boto3_iam_client.get_policy(PolicyArn=policy_arn)
         assert response.get("Policy"), f"Expected Policy in response:\n{response}"
-        assert response["Policy"].get("PolicyName") == policy_name, f"PolicyName should be equal to {policy_name}"
+        assert response["Policy"].get("Arn") == policy_arn, f"PolicyArn should be equal to {policy_arn}"
 
         return response
 
diff --git a/src/frostfs_testlib/s3/interfaces.py b/src/frostfs_testlib/s3/interfaces.py
index f3793e0..b1825d5 100644
--- a/src/frostfs_testlib/s3/interfaces.py
+++ b/src/frostfs_testlib/s3/interfaces.py
@@ -408,7 +408,7 @@ class S3ClientWrapper(HumanReadableABC):
         """Adds the specified user to the specified group"""
 
     @abstractmethod
-    def iam_attach_group_policy(self, group: str, policy_arn: str) -> dict:
+    def iam_attach_group_policy(self, group_name: str, policy_arn: str) -> dict:
         """Attaches the specified managed policy to the specified IAM group"""
 
     @abstractmethod