Client notification not working

The example BLE_client.ino does not get receive notification when pushing on buttons,

• yes my service UUID and characteristic are right as it is working with a raspberry pi with another software

static BLEUUID serviceUUID("00001812-0000-1000-8000-00805f9b34fb");
// The characteristic of the remote service we are interested in.
static BLEUUID charUUID("00002a4d-0000-1000-8000-00805f9b34fb");

• Arduino ESP32 vers 2.0.17 (tried many versions too)
• ESP32 Wrover

logs :
BLE Advertised Device found: Name: AB Shutter3, Address: ff:ff:11:33:98:d6, appearance: 964, serviceUUID: 00001812-0000-1000-8000-00805f9b34fb, serviceUUID: 00001812-0000-1000-8000-00805f9b34fb, rssi: -68
Forming a connection to ff:ff:11:33:98:d6

• Created client
• Connected to server
• Found our service
• Found our characteristic
  The characteristic value was:
  We are now connected to the BLE Server.
  Setting new characteristic value to "Time since boot: 3"

Any clue?

If anyone got the Client example to work with notification from a BLE device, please be super kind and tell me your ESP idf version , thx!