IpadOS 17.5.1 "Encryption is insufficient." when subscription

[gtedeschi]

Hi,
thank for your plugin, I need to thank all for your job!
I've a problems
I need to subscribe to service in a BLE device, in android there are no problems, but in IOS ( iPad 17.5.1) I'm not able to connect...

the steps are:

1. scan device
2. connect (disconnect - close - connect )
3. list services
4. list characteristics
5. subscribe to service - characteristic
6. write to service - charateristic
7. get data

In the 5 step, I catch this errors:

{"error":"subscription","message":"Error Domain=CBATTErrorDomain Code=15 "Encryption is insufficient." UserInfo={NSLocalizedDescription=Encryption is insufficient.}"

In IOS I didn't see the device until the step 2 (after that is connected, but disconnect and connect repeatly) so I think that could be a OS problems?

I've read some threads, make different changes of code nothing works... I'm not sure if the problem Is the I need to pair device, if this is the problems, is possible pair with the plugin? It's a IOS problem?
I've tried also with ligthblue, I'm not sure that works with subscription and write...

the plugin version:
"name": "cordova-plugin-bluetoothle",
"version": "6.7.4",

best regards!