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Pairing/Bonding not happening with iOS

Hi,

I am using nRF51-DK and nRF5_SDK_12.2.0_f012efa. I have programmed Proximity example from the SDK to the Development Kit and was able to successfully program the DK with the sample and i can see the device advertising on the nRF Connect App.

When i tried to pair with the DK from the nRF Connect App, it shows pairing popup for the first time with options pair and cancel. Now i can test the proximity alerts successfully. After this, i tried disconnecting the DK by turning off the bluetooth on the phone and when i turned it on again, its not reconnecting automatically. I have to connect again by going to the App. I tried forgetting the device from the Bluetooth settings of the iPhone and tried to connect the DK from nnRF Connect App, but this time it connects but i am not getting any pairing popup and i tried sending proximity alerts which doesn't work which means the device and DK are not bonded successfully.

1st Question: Why it is not reconnecting automatically when the device is paired with the phone already?

2nd Question: Why i am not getting pairing requests once i forget the device from the bluetooth settings of the iPhone?

Note: I have tried with other apps like nRF Toolbox and LightBlue but the behaviour remains same

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