Fail to connect iPad using iAP2

Hello.

device: iPad mini 4

iOS: 13.6.1

I'm developing MFi accessory via Bluetooth.

Many of case, connection procedures are terminated with following message.

Please let me know "STATUS 708". How can I avoid it?

584 error    16:30:47.107753+0900    bluetoothd     <private> disconnected with reason  STATUS 708
585 error    16:30:47.118230+0900    bluetoothd    Could not find remote SDP record for handle: 0x0000000104005750 (status=65535)
586 error    16:30:47.118577+0900    bluetoothd     <private> disconnected with reason OI_OK

I think my issue is similar but my target is Cypress(Broadcom) with MFi. It support Bluetooth 5.0.

https://discussions.apple.com/thread/251150893?answerId=252193442022#252193442022