Connect Huawei P20 with headphones?

Love community,

I have a question and although I have a Huawei P20 and now a headphone for music namely the PXC 480 of Sennheiser. However, my Huawei P20 has no 3.5mm jack but I only have a Huawei adapter that works from 3.5mm jack to USB-C plug. However, I can somehow not use the headphone with the adapter because then I hear no music at least not on the headphones only normal on the smartphone, maybe someone can help me there? The headphones can apparently also use Bluetooth, but that is not explained in the quick guide. I have already tried it over Bluetooth, but my smartphone does not find the headphones somehow.

As far as I know, he does not support Bluetooth.

Apparently the headphone does not work with my smartphone… I've sent the headphones back. In this case, a Bluetooth headset is probably the better solution.

Right.