I own iPad Pro 11, playing PUBGm too:)
Had a trouble to connect my HyperX Cloud gaming headphones with this adapter at first.
Nothing happening , only the clicking sound.
Other, smaller earbuds were working with this adapter out of box,no problem at all.
After several attempts I’ve realised the sequence how to make it working:
1 plug usb-c 3.5mm adapter to the iPad pro
2 slowly connect headphones to adapter
3 repeat section 2 if no success ( make sure you connecting headphones slowly )
I believe what happening here is some power/impedance restriction....My gaming headphones running at 30 mW power and Impedance: 30 Ω
It is probably at the edge what this adapter could support ( Apple gives ZERO information about this adapter specifications unfortunately)
When I was trying to connect HypeX cloud headphones to iPad Pro with the adapter already attached to them,I’ve never had a success .
Adapter goes to iPad first,gaming headset after.
There is no difference if you have small headphones you could attach to iPad in any order you like ,they will work .
But if you have some GOOD ,expensive headphones with Impedance higher than 35Ω you probably won’t be able to run with this adapter.
SteelSeries 3 are headphones with Impedance 32Ω,i believe they should work with this adapter if you’ll use sequence I’ve described earlier.