Airplay
When you unpair your iPhone 12 will you be able pair it back again to use it to AirPlay. I’m having trouble connecting it to airplay on my Lg tv. At one point it was working.
iPhone 12 Pro Max
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For AirPlay to work, verify that both devices are connected to the same home networks (same SSID for Wi-Fi).
The AirPlay receiving device should have its AirPlay capabilities activated. Verify this on-off setting.
Use AirPlay to stream video or mirror the screen of your iPhone or iPad - Apple Support
Some content may have restrictions for AirPlay. If you can AirPlay the most basic thing (e.g. iPhone home screen), then AirPlay itself is working, and the issue is elsewhere.