From what I gather, you are trying to connect the GTK-X1BT to the TV (XD8599).  If this is the case, then the GTK-X1BT is not designed to connect to the TV.

However, you could connect the GTK-X1BT to the TVs Headphone/Audio out socket via a 3.5mm to RCA cable, such as this one:

https://www.amazon.co.uk/Aptii-3-5mm-Phono-Audio-Cable-x/dp/B005M1LR1S/

Cheers