Screen mirroring keeps asking for code

Hello Lovyra,

We'd like to provide you with a few steps that may allow you to Mirror your iPhone to your LG WebOS Smart TV:

1. Restart your iPhone. This may seem like a simple steps to take but may help resolve the issue with the code being asked for repeatedly.
2. Update iOS on iPhone. Completing the software update ensures that your device has all the latest fixes. (Create a backup before proceeding)

Next, test the issue again using the guidance below:

"Mirror your iPhone, iPad, or iPod touch to a TV or Mac

1. Connect your iPhone, iPad, or iPod touch to the same Wi-Fi network as your Apple TV, AirPlay 2-compatible smart TV, or Mac.2

• Open Control Center:On iPhone X or later or iPad with iPadOS 13 or later: Swipe down from the upper-right corner of the screen.
• On iPhone 8 or earlier or iOS 11 or earlier: Swipe up from the bottom edge of the screen. 

1. Tap Screen Mirroring  .
2. Select your Apple TV, AirPlay 2-compatible smart TV, or Mac from the list.
3. If an AirPlay passcode appears on your TV screen or Mac, enter the passcode on your iOS or iPadOS device.

To stop mirroring your iOS or iPadOS device, open Control Center, tap Screen Mirroring, then tap Stop Mirroring. Or press the Menu button on your Apple TV Remote."

More details here: Use AirPlay to stream video or mirror the screen of your iPhone, iPad, or iPod touch

Thanks for posting in Apple Support Communities.

Best wishes!