Can”t watch Apple TV on my tv.

Verify that the connection is still working as intended.

Check speedtest to see current internet connection

Make sure DNS is set to auto (settings - network)

If on wifi try ethernet

To see a current status of the network get a report from stumbler, netstumbler or similar. Look for signal strength, noise, nearby networks

Did you check speedtest, what did it report?

Did you check DNS?

Did you try ethernet?

Did you run a network report? What were the results?

Without having information regarding exactly what you've done it is hard to assist.

I verified and it is. What kniw