Pairing with phone or tablet is only possible in our Jessie build of Max2Play. The new image currently only supports output devices like speakers.
Sorry about the inconvenience. The bluetooth protocol varies with each device. So we can only speak to the ones we use for testing here with certainty. While the pairing seems to not work, you were apparently able to connect with the speakers you use. So please try testing playback with the bluealsa output in your audioplayer and see if this enables pairing.