Hi,
I too had this issue, it's a misunderstanding of the usage. Basically the 1st time its easily paring, after that it will not pair like that.
From second time onwards we need to pair it manually. So please press the power button for 7 secs to enter into Paired mode. You will get power off/power on notification. Still continue to press it for 7 secs which will enter into pairing mode, then the actual Audio option of "WH-h910n" will be listed and registered under audio. You can ignore the "LE"WH-h910n".