The standard USB-C headset that came with my S20 Ultra stopped working.
If I plugin in a USB-C to aux adapter with another headset it still works. People's issues with USB-C to audio have been well documented and I appreciate the fact the USB-C adapter needs to be an interface rather than a passive convertor, but what is utterly baffling is that the bogg standard USB-C headset that came with my S20 Ultra used to work, but now doesn't.
As a process of elimination can you try the earphones in another phone.
Usually the earphones have a guarantee of around 6 months so my suggestion is to contact the outlet that supplied the phone or your Samsung Support Department to have them swapped out @RWJB
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Current Phone ~
Samsung Note 20 Ultra 5G SM-9820 _256Gb SnapDragon 865+
Samsung One Ui 2.5/ Android 10.