I just bought a Zenphone 8 and when ever I use the headphone jack and play any sound there is a constant static noise in the background. I tried a pair of in ear headphone, a headset and a stereo and all had the same result. All of those devises don't have the noise if I play audio from other sources when my new phone.
I'm running android 11 and when ever I search for new system updates it says i got the latest one. I also tried blowing out any potential dust out of the jack with compressed air and it didn't help.