How to setting external microphone with iPhone 13 pro?

Hi janna1963,

It sounds like you're unable to connect an accessory with the Lightning to 3.5 mm Headphone Jack Adapter. If so, is the adapter you're using an Apple accessory or Apple certified? The information below from the article here may help: Use Apple headphones with your iPhone, iPad, and iPod

"Learn more

• If you connect two headphones to an iOS device using both the 3.5 mm headphone jack and the Lightning connector, audio will play only from the last one you connect.
• When you use Apple headphones with earlier Apple products, you might be able to play audio, but not use other features. For example, volume or playback control might not work with Apple EarPods with 3.5 mm Headphone Plug on some iPod models.
• Find out what to do if your headphones don‘t work with your iPhone, iPad, or iPod touch.
• Get help if your iPhone is stuck in headphone mode.
• Get help with Beats products."

You can also find helpful information here: If your headphones don't work with your iPhone or iPad, and adjust audio settings with the help of the guide here: Adjust headphone audio settings on iPhone

If the issue remains, try with a different device and reach out to the manufacturer to further assist.

Support - How to Use - BOYA

Cheers.