Hi CryptoMitch,
Thanks for posting in Apple Support Communities! Since you're unable to stream from your iPhone to your TV, check the following:
- "Make sure that your AirPlay-compatible devices are turned on and near each other.
- Check that the devices are updated to the latest software and are on the same Wi-Fi network.
- Restart the devices that you want to use with AirPlay or screen mirroring."
These steps can resolve connection issues with the two devices and can be found in the article If screen mirroring or streaming isn't working on your AirPlay-compatible device. In this same article, there's a few other recommendations to try for specific instances under the section "Still need help?". Also, if you haven't already, try restarting both devices to see if anything changes. Restarting can fix many issues.
Should the above not resolve this issue for you, contact Apple Support for further assistance.
Cheers!