iPhone 14 not discovering Sony headphone

Hi ayushman48

welcome to the Apple (user-to-user) Community.

Re: "iPhone 14 not discovering Sony headphone"

If you haven't already, you might want to try wearing your headphone, 

and 

on iPhone: Try Settings > Bluetooth > tap "Not Connected"

or

You might want to check that you are only connecting headphone to one device at a time. (Eg may not be switching between multiple devices.)

See if turn off / turn on bluetooth helps

Check for tips:

For recent iPhones: Set up and use Bluetooth accessories on iPhone – Apple Support 

or

Pair a third-party Bluetooth accessory with your iPhone or iPad - Apple Support

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Re: compatibility:

You may want to check with Sony if a headphone firmware update is needed for compatibility with your iPhone 14's iOS version,

or

if you haven't already, your iPhone may need updating to the latest iOS version

(iOS 16.5).

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More trouble-shooting:

What to do: If you can't connect a Bluetooth accessory to your iPhone, iPad, or iPod touch - Apple Support

Also, something in here may help::

Resolve Wi-Fi and Bluetooth issues caused by wireless interference - Apple Support

More support if needed

iPhone Support:

(There's a "Get Support: start now" link (online chat, phone, eMail etc) at the bottom of their webpage... link below)

iPhone - Official Apple Support:

All the best :-)