diff --git a/src/python_testing/TC_ICDM_2_1.py b/src/python_testing/TC_ICDM_2_1.py
index ac20cf2c001fb0..63b27c64d6d8fa 100644
--- a/src/python_testing/TC_ICDM_2_1.py
+++ b/src/python_testing/TC_ICDM_2_1.py
@@ -109,6 +109,7 @@ def steps_TC_ICDM_2_1(self) -> list[TestStep]:
             TestStep(
                 9, "TH reads from the DUT the UserActiveModeTriggerInstruction attribute"),
             TestStep(10, "TH reads from the DUT the OperatingMode attribute."),
+            TestStep(11, "TH reads from the DUT the MaximumCheckInBackoff attribute."),
         ]
         return steps
 
@@ -254,8 +255,9 @@ async def test_TC_ICDM_2_1(self):
                                     "UserActiveModeTriggerInstruction is not in the correct format for the associated UserActiveModeTriggerHint")
 
             if uatHintInstructionDepedentBitmap > 0 and uatHintInstructionDepedentBitmap in kUatColorInstructionBitMask:
-                # TODO: https://github.com/CHIP-Specifications/connectedhomeip-spec/issues/9194
-                asserts.assert_true(False, "Nothing to do for now")
+                pattern = re.compile(r'^[0-9A-F]{6}$')
+                asserts.assert_true(pattern.match(userActiveModeTriggerInstruction),
+                                    "UserActiveModeTriggerInstruction is not in the correct format for the associated UserActiveModeTriggerHint")
         else:
             # Check if the UserActiveModeTriggerInstruction was required
             asserts.assert_false(uatHintInstructionDepedentBitmap in kUatInstructionMandatoryBitMask,
@@ -272,6 +274,16 @@ async def test_TC_ICDM_2_1(self):
 
             asserts.assert_less(
                 operatingMode, modes.kUnknownEnumValue, "OperatingMode can only have 0 and 1 as valid values")
+        self.step(11)
+        if self.pics_guard(self.check_pics("ICDM.S.A0009")):
+            maximumCheckInBackOff = await self._read_icdm_attribute_expect_success(attributes.MaximumCheckInBackOff)
+
+            asserts.assert_true(self.is_valid_uint32_value(maximumCheckInBackOff),
+                                "MaximumCheckInBackOff attribute is not a valid uint32.")
+            asserts.assert_greater_equal(maximumCheckInBackOff, idleModeDuration,
+                                         "MaximumCheckInBack attribute is not greater or euqal to the IdleModeDuration")
+            asserts.assert_less_equal(maximumCheckInBackOff, 64800,
+                                      "MaximumCheckInBackOff attribute is greater than maximum value (64800).")
 
 
 if __name__ == "__main__":
diff --git a/src/python_testing/test_testing/test_TC_ICDM_2_1.py b/src/python_testing/test_testing/test_TC_ICDM_2_1.py
index 5069eb6ed9d0a7..a337b91ccef41d 100755
--- a/src/python_testing/test_testing/test_TC_ICDM_2_1.py
+++ b/src/python_testing/test_testing/test_TC_ICDM_2_1.py
@@ -41,6 +41,7 @@ class ICDMData():
     UserActiveModeTriggerHint: int
     UserActiveModeTriggerInstruction: string
     OperatingMode: c.Enums.OperatingModeEnum
+    MaximumCheckInBackOff: int
     expect_pass: bool
 
 
@@ -57,145 +58,161 @@ class ICDMData():
     # --------
     # IdleModeDuration under minimum (< 1)
     ICDMData(0, 0, 0, 100, [], 0, 2, 0, "",
-             c.Enums.OperatingModeEnum.kSit, False),
+             c.Enums.OperatingModeEnum.kSit, 64800, False),
     # IdleModeDuration at minimum
     ICDMData(0, 1, 0, 100, [], 0, 2, 0, "",
-             c.Enums.OperatingModeEnum.kSit, True),
+             c.Enums.OperatingModeEnum.kSit, 64800, True),
     # IdleModeDuration at maximum
     ICDMData(0, 64800, 100, 100, [], 0, 2, 0, "",
-             c.Enums.OperatingModeEnum.kSit,  True),
+             c.Enums.OperatingModeEnum.kSit,  64800, True),
     # IdleModeDuration over maximum (>64800)
     ICDMData(0, 64801, 100, 100, [], 0, 2, 0, "",
-             c.Enums.OperatingModeEnum.kSit, False),
+             c.Enums.OperatingModeEnum.kSit, 64800, False),
     # IdleModeDuration < ActiveModeDuration
     ICDMData(0, 1, 1001, 100, [], 0, 2, 0, "",
-             c.Enums.OperatingModeEnum.kSit, False),
+             c.Enums.OperatingModeEnum.kSit, 64800, False),
     # --------
     # Test cases to validate ActiveModeDuration
     # --------
     # ActiveModeDuration under minimum
     ICDMData(0, 100, -1, 100, [], 0, 2, 0, "",
-             c.Enums.OperatingModeEnum.kSit, False),
+             c.Enums.OperatingModeEnum.kSit, 64800, False),
     # ActiveModeDuration at minimum
     ICDMData(0, 100, 0, 100, [], 0, 2, 0, "",
-             c.Enums.OperatingModeEnum.kSit, True),
+             c.Enums.OperatingModeEnum.kSit, 64800, True),
     # ActiveModeDuration at maximum - value is max IdleModeDuration value - 1
     ICDMData(0, 64800, 0x3DCC4FF, 100, [], 0, 2, 0, "",
-             c.Enums.OperatingModeEnum.kSit, True),
+             c.Enums.OperatingModeEnum.kSit, 64800, True),
     # --------
     # Test cases to validate ActiveModeThreshold
     # --------
     # ActiveModeThreshold < minimum
     ICDMData(0, 1, 0, -1, [], 0, 2, 0, "",
-             c.Enums.OperatingModeEnum.kSit, False),
+             c.Enums.OperatingModeEnum.kSit, 64800, False),
     # ActiveModeThreshold at SIT minimum
     ICDMData(0, 1, 0, 0, [], 0, 2, 0, "",
-             c.Enums.OperatingModeEnum.kSit, True),
+             c.Enums.OperatingModeEnum.kSit, 64800, True),
     # ActiveModeThreshold under LIT minimum
     ICDMData(0x7, 1, 0, 4999, [], 0, 2, 0, "",
-             c.Enums.OperatingModeEnum.kLit, False),
+             c.Enums.OperatingModeEnum.kLit, 64800, False),
     # ActiveModeThreshold at LIT minimum
     ICDMData(0x7, 1, 0, 5000, [], 0, 2, 0, "",
-             c.Enums.OperatingModeEnum.kLit, True),
+             c.Enums.OperatingModeEnum.kLit, 64800, True),
     # ActiveModeThreshold at Maximum
     ICDMData(0, 1, 0, 0xFFFF, [], 0, 2, 0, "",
-             c.Enums.OperatingModeEnum.kSit, True),
+             c.Enums.OperatingModeEnum.kSit, 64800, True),
     # ActiveModeThreshold over Maximum
     ICDMData(0, 1, 0, 0x10000, [], 0, 2, 0, "",
-             c.Enums.OperatingModeEnum.kSit, False),
+             c.Enums.OperatingModeEnum.kSit, 64800, False),
     # --------
     # Test cases to validate ClientsSupportedPerFabric
     # --------
     # ClientsSupportedPerFabric under minimum (< 1)
     ICDMData(0, 1, 0, 100, [], 0, 0, 0, "",
-             c.Enums.OperatingModeEnum.kLit, False),
+             c.Enums.OperatingModeEnum.kLit, 64800, False),
     # ClientsSupportedPerFabric at minimum
     ICDMData(0, 1, 0, 100, [], 0, 1, 0, "",
-             c.Enums.OperatingModeEnum.kLit, True),
+             c.Enums.OperatingModeEnum.kLit, 64800, True),
     # ClientsSupportedPerFabric at maximum
     ICDMData(0, 1, 0, 100, [], 0, 255, 0, "",
-             c.Enums.OperatingModeEnum.kLit, True),
+             c.Enums.OperatingModeEnum.kLit, 64800, True),
     # ClientsSupportedPerFabric > maximum
     ICDMData(0, 1, 0, 100, [], 0, 256, 0, "",
-             c.Enums.OperatingModeEnum.kLit, True),
+             c.Enums.OperatingModeEnum.kLit, 64800, True),
     # --------
     # Test cases to validate RegisteredClients
     # --------
     # Incorrect type
     ICDMData(0, 1, 0, 100, 0, 0, 1, 0, "",
-             c.Enums.OperatingModeEnum.kLit, False),
+             c.Enums.OperatingModeEnum.kLit, 64800, False),
     # Correct type
     ICDMData(0, 1, 0, 100, [], 0, 1, 0, "",
-             c.Enums.OperatingModeEnum.kLit, True),
+             c.Enums.OperatingModeEnum.kLit, 64800, True),
     # --------
     # Test cases to validate ICDCounter
     # --------
     # ICDCounter under minimum (< 0)
     ICDMData(0, 1, 0, 100, [], -1, 1, 0, "",
-             c.Enums.OperatingModeEnum.kLit, False),
+             c.Enums.OperatingModeEnum.kLit, 64800, False),
     # ICDCounter at minimum
     ICDMData(0, 1, 0, 100, [], 0, 1, 0, "",
-             c.Enums.OperatingModeEnum.kLit, True),
+             c.Enums.OperatingModeEnum.kLit, 64800, True),
     # ICDCounter at maximum
     ICDMData(0, 1, 0, 100, [], 0xFFFFFFFF, 1, 0, "",
-             c.Enums.OperatingModeEnum.kLit, True),
+             c.Enums.OperatingModeEnum.kLit, 64800, True),
     # ICDCounter over maximum
     ICDMData(0, 1, 0, 100, [], 0x100000000, 1, 0, "",
-             c.Enums.OperatingModeEnum.kLit, False),
+             c.Enums.OperatingModeEnum.kLit, 64800, False),
     # --------
     # Test cases to validate UserActiveModeTriggerHint
     # --------
     # UserActiveModeTriggerHint outsite valid range
     ICDMData(0, 1, 0, 100, [], 0, 1, 0x1FFFF, "",
-             c.Enums.OperatingModeEnum.kLit, False),
+             c.Enums.OperatingModeEnum.kLit, 64800, False),
     # UserActiveModeTriggerHint outsite valid range
     ICDMData(0, 1, 0, 100, [], 0, 1, -1, "",
-             c.Enums.OperatingModeEnum.kLit, False),
+             c.Enums.OperatingModeEnum.kLit, 64800, False),
     # UserActiveModeTriggerHint with no hints
     ICDMData(0, 1, 0, 100, [], 0, 1, 0, "",
-             c.Enums.OperatingModeEnum.kLit, True),
+             c.Enums.OperatingModeEnum.kLit, 64800, True),
     # UserActiveModeTriggerHint wiht two instruction depedent bits set
     ICDMData(0, 1, 0, 100, [], 0, 1, uat.kCustomInstruction | uat.kActuateSensorSeconds, "",
-             c.Enums.OperatingModeEnum.kLit, False),
+             c.Enums.OperatingModeEnum.kLit, 64800, False),
     # --------
     # Test cases to validate UserActiveModeTriggerInstruction
     # --------
     # UserActiveModeTriggerInstruction with wrong encoding
     ICDMData(0, 1, 0, 100, [], 0, 1, uat.kCustomInstruction, "Hello\uD83D\uDE00World",
-             c.Enums.OperatingModeEnum.kLit, False),
+             c.Enums.OperatingModeEnum.kLit, 64800, False),
     # UserActiveModeTriggerInstruction with empty string
     ICDMData(0, 1, 0, 100, [], 0, 1, uat.kCustomInstruction, "",
-             c.Enums.OperatingModeEnum.kLit, True),
+             c.Enums.OperatingModeEnum.kLit, 64800, True),
     # UserActiveModeTriggerInstruction with empty string
     ICDMData(0, 1, 0, 100, [], 0, 1, uat.kCustomInstruction, "",
-             c.Enums.OperatingModeEnum.kLit, True),
+             c.Enums.OperatingModeEnum.kLit, 64800, True),
     # UserActiveModeTriggerInstruction with max string length
     ICDMData(0, 1, 0, 100, [], 0, 1, uat.kCustomInstruction, long_string,
-             c.Enums.OperatingModeEnum.kLit, True),
+             c.Enums.OperatingModeEnum.kLit, 64800, True),
     # UserActiveModeTriggerInstruction > max string length
     ICDMData(0, 1, 0, 100, [], 0, 1, uat.kCustomInstruction, too_long_string,
-             c.Enums.OperatingModeEnum.kLit, False),
+             c.Enums.OperatingModeEnum.kLit, 64800, False),
     # UserActiveModeTriggerInstruction invalid number - Trailing 0s
     ICDMData(0, 1, 0, 100, [], 0, 1, uat.kActuateSensorSeconds, "001",
-             c.Enums.OperatingModeEnum.kLit, False),
+             c.Enums.OperatingModeEnum.kLit, 64800, False),
     # UserActiveModeTriggerInstruction invalid number - Letters
     ICDMData(0, 1, 0, 100, [], 0, 1,  uat.kActuateSensorSeconds, "not a number",
-             c.Enums.OperatingModeEnum.kLit, False),
+             c.Enums.OperatingModeEnum.kLit, 64800, False),
     # UserActiveModeTriggerInstruction Valid number
     ICDMData(0, 1, 0, 100, [], 0, 1,  uat.kActuateSensorSeconds, "100000",
-             c.Enums.OperatingModeEnum.kLit, True),
+             c.Enums.OperatingModeEnum.kLit, 64800, True),
+    ICDMData(0, 1, 0, 100, [], 0, 1, uat.kActuateSensorLightsBlink, "", c.Enums.OperatingModeEnum.kLit, 64800, False),
+    ICDMData(0, 1, 0, 100, [], 0, 1, uat.kActuateSensorLightsBlink, "AAAAAAA", c.Enums.OperatingModeEnum.kLit, 64800, False),
+    ICDMData(0, 1, 0, 100, [], 0, 1, uat.kActuateSensorLightsBlink, "AAAAA", c.Enums.OperatingModeEnum.kLit, 64800, False),
+    ICDMData(0, 1, 0, 100, [], 0, 1, uat.kActuateSensorLightsBlink, "AAAAAK", c.Enums.OperatingModeEnum.kLit, 64800, False),
+    ICDMData(0, 1, 0, 100, [], 0, 1, uat.kActuateSensorLightsBlink, "012345", c.Enums.OperatingModeEnum.kLit, 64800, True),
     # --------
     # Test cases to validate OpertingMode
     # --------
     # OpertingMode with negative value
     ICDMData(0, 1, 0, 100, [], 0, 1,  uat.kActuateSensorSeconds, "100000",
-             -1, False),
+             -1, 64800, False),
     # OpertingMode with Accepted value
     ICDMData(0, 1, 0, 100, [], 0, 1,  uat.kActuateSensorSeconds, "100000",
-             c.Enums.OperatingModeEnum.kLit, True),
+             c.Enums.OperatingModeEnum.kLit, 64800, True),
     # OpertingMode with unkown value
     ICDMData(0, 1, 0, 100, [], 0, 1,  uat.kActuateSensorSeconds, "100000",
-             c.Enums.OperatingModeEnum.kUnknownEnumValue, False),
+             c.Enums.OperatingModeEnum.kUnknownEnumValue, 64800, False),
+    # --------
+    # Test cases to validate MaximumCheckInBackOff
+    # --------
+    ICDMData(0, 1, 0, 100, [], 0, 1,  uat.kActuateSensorSeconds, "100000",
+             c.Enums.OperatingModeEnum.kUnknownEnumValue, 0, False),
+    ICDMData(0, 1, 0, 100, [], 0, 1,  uat.kActuateSensorSeconds, "100000",
+             c.Enums.OperatingModeEnum.kSit, 1, True),
+    ICDMData(0, 1, 0, 100, [], 0, 1,  uat.kActuateSensorSeconds, "100000",
+             c.Enums.OperatingModeEnum.kSit, 64800, True),
+    ICDMData(0, 1, 0, 100, [], 0, 1,  uat.kActuateSensorSeconds, "100000",
+             c.Enums.OperatingModeEnum.kSit, 64801, False),
 
 ]
 
@@ -205,13 +222,13 @@ def test_spec_to_attribute_cache(test_icdm: ICDMData) -> Attribute.AsyncReadTran
     resp.attributes = {0: {c: {attr.FeatureMap: test_icdm.FeatureMap, attr.IdleModeDuration: test_icdm.IdleModeDuration, attr.ActiveModeDuration: test_icdm.ActiveModeDuration, attr.ActiveModeThreshold: test_icdm.ActiveModeThreshold,
                                attr.RegisteredClients: test_icdm.RegisteredClients, attr.ICDCounter: test_icdm.ICDCounter,
                                attr.ClientsSupportedPerFabric: test_icdm.ClientsSupportedPerFabric, attr.UserActiveModeTriggerHint: test_icdm.UserActiveModeTriggerHint,
-                               attr.UserActiveModeTriggerInstruction: test_icdm.UserActiveModeTriggerInstruction, attr.OperatingMode: test_icdm.OperatingMode}}}
+                               attr.UserActiveModeTriggerInstruction: test_icdm.UserActiveModeTriggerInstruction, attr.OperatingMode: test_icdm.OperatingMode, attr.MaximumCheckInBackOff: test_icdm.MaximumCheckInBackOff}}}
     return resp
 
 
 def main():
     pics = {"ICDM.S.A0000": True, "ICDM.S.A0001": True, "ICDM.S.A0002": True, "ICDM.S.A0003": True, "ICDM.S.A0004": True,
-            "ICDM.S.A0005": True, "ICDM.S.A0006": True, "ICDM.S.A0007": True, "ICDM.S.A0008": True, }
+            "ICDM.S.A0005": True, "ICDM.S.A0006": True, "ICDM.S.A0007": True, "ICDM.S.A0008": True, "ICDM.S.A0009": True, }
 
     test_runner = MockTestRunner(
         'TC_ICDM_2_1', 'TC_ICDM_2_1', 'test_TC_ICDM_2_1', 0, pics)