Service changes in run time are not getting refreshed in ios BLE clients even upon implementing the refresh characteristics in server

[BestBot7]

I have implemented the refresh characteristics with service UUID 0x1801 and characteristic UUID 0x2a05 which are meant for indicating the service changes in the server to the ios BLE clients. I have implemented this on esp32c3. In nrf connect mobile app for android, we have a feature to refresh services in the run time with keeping the connection. But ios requires an indication to refresh the services and detect service change. I am not receiving any indication in my mobile app. Please help me in implementing this refresh characteristics properly and how to check the indication value on my ios mobile. Thanks in advance.