Question about Xiaomi TV Box S 4K (2nd Gen)

Hello Community, I need an audio splitter so that I can use two Bluetooth headphones via the Xiaomi TV Box S 4K (2nd Gen). When I connect the two Bluetooth headphones directly via the Xiaomi TV Box S 4K (2nd Gen) via Bluetooth, only one Bluetooth headphone works at a time. I still have an old splitter which I have unfortunately tried in vain to get to work via a jack. Is there a device that I can connect to the Xiaomi TV Box S 4K (2nd Gen) via Bluetooth in order to connect at least 2 (preferably three) Bluetooth headphones to the device? Goal: It should be possible to connect at least two Bluetooth headphones to the Xiaomi TV Box via an additional device. I asked Mr Google and got the result that the TV Box can only control one Bluetooth headset and this statement " ... Another option is to use a Bluetooth audio splitter , which can also divide the audio signal from your Mi TV to multiple headphones. ...". Note: I don't have a TV with working Bluetooth, so a diversion via the TV is out of the question. Does anyone have any tips?