Alright. Thanks for clarifying.
Set up the Apple TV Remote on your iPhone or iPad - Apple Support
If you have the widget in Control Center and can open that, then it should be able to find Apple TV boxes (and select compatible smart TVs) on the same home network as what the iPhone is connected to.
- Restart your Apple TV box or AirPlay-compatible smart TV.
- Also try restarting your iPhone (or iPad).
- If you still can't set up the Apple TV Remote, contact Apple Support.
Verify that your home network is set up as recommended, with one SSID network name for all the wireless (2.4 GHz and 5 GHz combined). If different network names are used, then devices on one part cannot communicate with devices on the other part. If connected to a “guest network”, then that gets only internet connectivity, not communication with other network devices. Recommended settings for Wi-Fi routers and access points - Apple Support