This forum post is not for your specific model but just try to see if any of the similar step exist and solve your issue (because the issues seem similar) XPS 13 plus sound not working - Dell Community
Recently I can only hear audio if I plug headphones into the PC, there is no sound via the speakers. I have checked and installed the latest Dell updates; I've run the Windows 11 troubleshooter; and I've checked the MaxxAudioPro settings, and I've tried uninstalling and reinstalling the audio driver, to no avail. Any suggestions very gratefully received. Many thanks.
XPS 13 9305 speaker issue