AirPlay iPhone 7 not working

Cross ~ With older model iPhones, it's worth checking for a weak battery...

Does your iPhone 7 still have its original battery?

And what's the Maximum Capacity % here?...

Settings > Battery > Battery Health

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Hi Cross7763,

We'll be glad to help out with AirPlay on your device. In order to stream content from your iPhone to your AirPlay enabled device, follow the steps here:

"Stream video from your iPhone, iPad, or iPod touch to a TV

1. Connect your device to the same Wi-Fi network as your Apple TV or AirPlay 2-compatible smart TV.
2. Find the video that you want to stream.
3. Tap AirPlay . In some apps, you might need to tap a different button first.1 For example, in the Photos app, tap Share , then tap AirPlay .
4. Choose your Apple TV or AirPlay 2-compatible smart TV.

To stop streaming, tap AirPlay  in the app that you're streaming from, then tap your iPhone, iPad, or iPod touch from the list."

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

If you're doing that and still having issues, powering off your TV, network devices (modem and router), and iPhone; then powering them back on may help as well.

We hope this helps out.

Cheers.