We have also observed that the beacon RSSI reading is 0 most of the times and when values are received, they typically fall between 0 and -90 dBm. We have not encountered any values lower than -90. Are there any settings/configuration we can apply to receive more accurate RSSI measurements? Device Information: iOS version 17 and 18

I can confirm that the beacons that we are using are fully compatible with the iBeacon specification. Note: Our beacon also supports detection via Bluetooth along with iBeacon.