Switch to external headphones over AUX not working

Hey everybody,

normally, I’m using my hearing aids via bluetooth with my U5. Unfortunately, my ears are cankerous at the moment, so that I cannot really use the hearing aids.

I wanted to watch a movie with my over ear headphones via the AUX-output, but unfortunately, the projector doesn’t switch to the headphones and plays the sound via the internal soundbar. I triead several devices with 3.5mm Jack. Nothing worked.

Do I miss something?