Sony STR-AZ3000ES Startup Manual page 447

Help Guide
Multi Channel AV Receiver
STR-AZ7000ES/STR-AZ5000ES/STR-AZ3000ES
Pairing cannot be done.
Move the BLUETOOTH device closer to the receiver.
Pairing may not be possible if there are other BLUETOOTH devices near the receiver. In this case, turn off the other BLUETOOTH devices.
Correctly enter the same passkey that was entered on the BLUETOOTH device.
Enter "0000" when you are prompted for a passkey during the pairing operation.
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