Why did you go for BT 4.2 today?
The first one I linked to is good and recently updated to 5.0 (going by the older BT4.1 version) and you can get similar cheaper products from the likes of BlitzWolf etc.
You wasted £324 on poop and could have got it for £10 more (return it as not fit for purpose)
Bluetooth 5.0 Transmitter Receiver Bypass, BlitzWolf 3 in 1
264ft Long Range Wireless Audio Adapter for TV PC Home Audio Stereo System, Dual Link, Optical RCA AUX 3.5mm
(not aptx HD)
Audio Receivers | Shop Best Receivers Products at BlitzWolf.com