Hi Ketan Ingale1,
Thank you for reaching Microsoft Community. We appreciate for sharing your concern to us.
Will you check Control panel under sounds category and see if the earphone is not hidden?
Open Control Panel >> Hardware and sounds.
Also check device manager for driver USB driver error, if a USB driver is showing yellow triangle mark try to update the driver if that still doesn't uninstall/reinstall the driver. You can send a photo on your response if a driver is showing in Device manager when the earphone is plugged in.
Does this earphone support USB-C with USB 4.0/ Thunderbolt™ 4 cable?
I need the following details to help us isolate the problem as this might be a compatibility issue. You may also reach out the manufacturer (OnePlus) to confirm its feature and devices that are compatible with the earphone.
I hope to hear from you soon.
Kind regards,
Lavenia