So...dear Samsung..and dear Samsung users...I have the same issue when I plug my earphones from akg thea Samsung so gracefully provided. Hail Samsung...And people please listen...its a software issue and I can prove it . I had the ideea to reset all settings of the phone and the issue went away for two minutes. ITS A SOFTWARE ISSUE and not hardware wich #Samsung is ignoring.. the only response form them is to send you to service...can you stay whiteout your phone?
Once again HAIL SAMSUNG
I had a similar problem with my "note 20" and I solved it with the specific SAMSUNG USB-C > jack 3.5mm cod. EE-UC10JUWEGWW adapter.
I tried to plug the headphone with the phone using my huawei tablet adapter obtaining the warning "device not supported" with more than a headphone, I think the problem is due to the adapter wiring diagram.