My iPhone won’t recognize my smart tv. Has in the past but won’t now

Hello Mydogbandit

To help resolve this issue, make sure your iPhone has the latest iOS version by following the steps from this article: Update your iPhone or iPad - Apple Support

Update your iPhone or iPad wirelessly

1. Back up your device using iCloud or your computer.

2. Plug your device into power and connect to the internet with Wi-Fi.

3. Go to Settings > General, then tap Software Update.

4. If you see more than one software update option available, choose the one that you want to install.

5. Tap Install Now. If you see Download and Install instead, tap it to download the update, enter your passcode, then tap Install Now. If you don't know your passcode, learn what to do.

Make sure there aren't any updates for your television.

Follow the steps from this article you referenced: "Use AirPlay to stream video or mirror the screen of your iPhone, iPad, or iPod touch."

Best Regards.