My old airplay stopped working. Did i miss something?

What is your model Apple TV? Identify your Apple TV model - Apple Support

What type of content where you trying to AirPlay? From which app/streaming service? Not all content is supported for AirPlay.

• Use AirPlay to stream video or mirror your device’s screen - Apple Support
• If AirPlay or screen mirroring isn’t working on your device - Apple Support

2liveascarle Said:

"My old airplay stopped working. Did i miss something?"

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YouTube is no longer to be usable with Apple TV 3 and before versions. So, if it is YouTube you are unable to use, then you would be getting errors using AirPlay through your Apple TV that way.

YouTube on the Apple TV (3rd generation) will end early March 2021. But YouTube through AirPlay should continue to work.