AirPlay won’t connect to Samsung tv

Assuming your TV is a compatible smart TV, Try unplugging the TV for about 30 seconds and then plug it in again. While you are waiting, force restart your phone.

Force restart iPhone - Apple Support

Hi Ljh24,

First, we suggest making sure that your TV is AirPlay compatible. You can find out which TVs are by visiting this link: Apple TV app - Devices - Apple

Then, make sure you're following the steps here to use AirPlay: Use AirPlay to stream video or mirror the screen of your iPhone or iPad - Apple Support

Take care.