Using headphones with TV Headphone Splitter on TV?



Hello all I just bought a
Hisense 40A4BGTUK (40 Inch) HD Smart TV
and a
UGREEN Headphone Splitter 2 Way Y 3.5mm Jack Aux Adapter Dual Earphone Headset Splitter Male to 2 Female Hi-Fi Stereo Audio Extension
so my missus and I can watch TV with us both using wired headphones. However, neither headphones worked when using the splitter. Only worked when using the headphones singly plugged directly into the headphone socket on the TV? why is that?
So I thought well I will buy two bluetooth headphones and stick in a Bluetooth transmitter into the TV and connect both headphones to the blue tooth transmitter, but only one set of headphones worked. Maybe if I buy another bluetooth transmitter and plug that into the other spare USB port then both bluetooth headphones will work is that right?
Ideally Id rather just use the wired headphones as so much easier, is there no way of using two wired headphones with my TV?
ANy help appreciated.
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I plugged the Wired Headphones into the Headphones port on the TV and they work great. But when I plug two wired headphones into the splitter and plug the splitter into the TV headphones port NEITHER headphones work? Why, how do I get the wired headphones to work?
Thanks
(except air quality and Medical Science
EDIT - found it. It has optical audio out, which will be at fixed level, regardless of volume setting on the TV.
Get an optical Toslink cable long enough to go across or round the room, and a headphone amplifier with optical input, two headphone output, and volume control.
I'm sure there'll be one on Amazon