iphone 11 is not recognizing usb hifi audio

Hi FB-111A,

Thanks for posting in Apple Support Communities.

If USB isn't being recognized, make sure that iPhone connects with other devices properly. You may have to manually allow access to iPhone from within the settings.

Allow access to USB, Thunderbolt, and other accessories

You can allow your iPhone, iPad, or iPod touch to always access accessories. For example, if you use a USB assistive device to enter your passcode on your locked iPhone, many assistive devices automatically turn on the setting to allow USB devices the first time they're connected.

If you don't connect to accessories regularly, you might need to turn on this setting manually.

In Settings, go to Face ID & Passcode or Touch ID & Passcode, and turn on Accessories under Allow Access When Locked.

When the Accessories setting is off, you might need to unlock your device to connect accessories.

Administrators can control the Accessories setting on supervised devices using Apple Configurator or mobile device management.

You can find these steps in Allow USB and other accessories to connect to your iPhone, iPad, or iPod touch - Apple Support.

Regards.

Hi FB-111A,

We would suggest updating your iOS software. iOS updates contain fixes that can address unexpected behaviors such as this:

Update your iPhone or iPad - Apple Support

If the issue persists after updating, contacting Apple Support would be the best path forward to resolve this issue. They will be best equipped to investigate this further for you:

Get Support

Cheers!