Hello NormanOsborn,
For difficulties with AirPlay you'll want to take the steps below:
After each step, see if you still need help.
1. Make sure that your AirPlay-compatible devices are turned on and near each other.
2. Check that the devices are updated to the latest software and are on the same Wi-Fi network.
3. Restart the devices that you want to use with AirPlay or screen mirroring.
You can also find those steps in this resource: If screen mirroring or streaming isn't working on your AirPlay-compatible device - Apple Support
Should that behavior still persist, you'll want to reach out to Apple Support so they can look into this further: Contact - Official Apple Support
Take care.