diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index b811c574..fb25f57f 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -19,6 +19,7 @@ Fixed
 -----
 * Fixed ``discovered_devices_and_advertisement_data`` returning devices that should
   be filtered out by service UUIDs. Fixes #1576.
+* Fixed a ``Descriptor None was not found!`` exception occurring in ``start_notify()`` on Android. Fixes #823.
 
 `0.22.1`_ (2024-05-07)
 ======================
diff --git a/bleak/backends/p4android/defs.py b/bleak/backends/p4android/defs.py
index f5245450..832f92bc 100644
--- a/bleak/backends/p4android/defs.py
+++ b/bleak/backends/p4android/defs.py
@@ -5,6 +5,7 @@
 from jnius import autoclass, cast
 
 import bleak.exc
+from bleak.uuids import normalize_uuid_16
 
 # caching constants avoids unnecessary extra use of the jni-python interface, which can be slow
 
@@ -87,4 +88,4 @@ class ScanFailed(enum.IntEnum):
     BluetoothGattCharacteristic.PROPERTY_WRITE_NO_RESPONSE: "write-without-response",
 }
 
-CLIENT_CHARACTERISTIC_CONFIGURATION_UUID = "2902"
+CLIENT_CHARACTERISTIC_CONFIGURATION_UUID = normalize_uuid_16(0x2902)