Yes it works, I use the adapter myself with the S20.

I can confirm this: Headphone connection works with S20 Ultra. What does not work is connecting a microphone. It is only for headphones.

Hello, does it also work for the microhphen S20FE? I have a real problem with microphones and I don't know if it works.

Not an answer, but an additional question: does the Samsung adapter also work with a Google Pixel 6a? (perhaps the USB-C to 3.5mm headphone conversion is a kind of standard that most Android's or associated adapters adhere to).