diff --git a/.azure-pipelines/impacted_area_testing/calculate_instance_number.py b/.azure-pipelines/impacted_area_testing/calculate_instance_number.py
index 4aa14336c1..92489a6fc7 100644
--- a/.azure-pipelines/impacted_area_testing/calculate_instance_number.py
+++ b/.azure-pipelines/impacted_area_testing/calculate_instance_number.py
@@ -1,7 +1,6 @@
 import os
 import argparse
 import math
-import json
 from constant import PR_CHECKER_TOPOLOGY_NAME, MAX_INSTANCE_NUMBER, MAX_GET_TOKEN_RETRY_TIMES
 from azure.kusto.data import KustoConnectionStringBuilder, KustoClient
 from datetime import datetime, timezone
@@ -41,12 +40,11 @@ def get_access_token():
 
     # 1. Run az login with re-try
     az_login_cmd = f"az login --identity --username {managed_identity_id}"
-    print(az_login_cmd)
     az_login_attempts = 0
     while az_login_attempts < MAX_GET_TOKEN_RETRY_TIMES:
         try:
-            os.popen(az_login_cmd)
-            # print(result.read())
+            result = os.popen(az_login_cmd)
+            print(result.read())
             print(f"Az login successfully. Login time: {datetime.now(timezone.utc)}")
             break
         except Exception as exception:
@@ -61,25 +59,20 @@ def get_access_token():
         raise Exception(f"Failed to az login after {MAX_GET_TOKEN_RETRY_TIMES} attempts.")
 
     # 2. Get access token with re-try
-    get_token_cmd = f"az login --identity --username {managed_identity_id} " \
-                    f"& az account get-access-token --resource https://api.kusto.windows.net --query accessToken -o tsv"
+    get_token_cmd = "az account get-access-token --resource https://api.kusto.windows.net --query accessToken -o tsv"
     print(get_token_cmd)
     get_token_attempts = 0
     while get_token_attempts < MAX_GET_TOKEN_RETRY_TIMES:
         try:
             result = os.popen(get_token_cmd)
             # token = os.popen(get_token_cmd)
-            print(result.read())
-            token = json.loads(result.read())
-            access_token = token.get("accessToken", None)
+            access_token = result.read()
+            print(access_token)
+            # token = json.loads(result.read())
+            # access_token = token.get("accessToken", None)
             if not access_token:
                 raise Exception("Parse token from stdout failed, accessToken is None.")
 
-            # Parse token expires time from string
-            token_expires_on = token.get("expiresOn", "")
-            if token_expires_on:
-                print(f"Get token successfully. Token will expire on {token_expires_on}.")
-
             return access_token
 
         except Exception as exception: