My one earphone is not working.I had purchased them along with phone on dt.11.12.2021
My one side earphone is not working.
iPhone 11, iOS 14
The support article you came here from should provide you with the steps needed to try to resolve this issue. Have you tried them all yet? If so, and they didn't help, I suggest that you contact Apple Support directly. To do so, simply select the "Get Support" link in the upper right-hand side of this forum's web page.