diff --git a/common/sai.py b/common/sai.py
index 3b7fd28b..623dbcc7 100644
--- a/common/sai.py
+++ b/common/sai.py
@@ -338,7 +338,9 @@ def get_by_type(self, obj, attr, attr_type, do_assert=False):
         unsupported_types = [
                                 "sai_port_eye_values_list_t", "sai_prbs_rx_state_t",
                                 "sai_port_err_status_list_t", "sai_fabric_port_reachability_t",
-                                "sai_port_lane_latch_status_list_t", "sai_latch_status_t"
+                                "sai_port_lane_latch_status_list_t", "sai_latch_status_t",
+                                "sai_port_frequency_offset_ppm_list_t", "sai_port_snr_list_t",
+                                "sai_acl_chain_list_t"
                             ]
         if attr_type == "sai_object_list_t":
             status, data = self.get(obj, [attr, "1:oid:0x0"], do_assert)
@@ -710,4 +712,4 @@ def __parse_rec(self, fname):
                     tokens = tokens[1:]
                 data.append(tokens)
             rec[cnt] = data #if len(data) > 1 else data[0]
-        return rec
+        return rec
\ No newline at end of file
diff --git a/tests/api/test_isolation_group_member.py b/tests/api/test_isolation_group_member.py
index 7fa6b50d..9ad26a24 100644
--- a/tests/api/test_isolation_group_member.py
+++ b/tests/api/test_isolation_group_member.py
@@ -1,6 +1,19 @@
 from pprint import pprint
 
+import pytest
 
+@pytest.fixture(scope="module", autouse=True)
+def discovery(npu):
+    npu.objects_discovery()
+
+@pytest.fixture(scope='module', autouse=True)
+def skip_all(testbed_instance):
+    testbed = testbed_instance
+    if testbed is not None and len(testbed.npu) != 1:
+        pytest.skip('invalid for {} testbed'.format(testbed.name))
+
+
+@pytest.mark.npu
 class TestSaiIsolationGroupMember:
     # object with parent SAI_OBJECT_TYPE_ISOLATION_GROUP SAI_OBJECT_TYPE_PORT SAI_OBJECT_TYPE_BRIDGE_PORT
 
diff --git a/tests/test_l2_basic.py b/tests/test_l2_basic.py
index 33e6f82e..ce3e6d20 100644
--- a/tests/test_l2_basic.py
+++ b/tests/test_l2_basic.py
@@ -909,4 +909,4 @@ def test_l2_mac_move_1(npu, dataplane):
             npu.create_vlan_member(npu.default_vlan_oid, npu.dot1q_bp_oids[idx], "SAI_VLAN_TAGGING_MODE_UNTAGGED")
             npu.set(npu.port_oids[idx], ["SAI_PORT_ATTR_PORT_VLAN_ID", npu.default_vlan_id])
 
-        npu.remove(vlan_oid)
+        npu.remove(vlan_oid)
\ No newline at end of file