Airplay doesn’t work with youtube

Ive tested this a few ways and what I have found is that all the common things to check like same network blah blah Have nothing do do with the issue. Ive done all the normal troubleshooting. Including factory resetting every device.

All airplay to anything works as expected so you can rule out all the normal trouble shooting. It has nothing do do with DNS. It has everything to do with YouTube blocking video with airplay.

airplay with a home video recording works.

airplay with a streaming service like vudu or tmz works.

airplay from any browser on iPad with YouTube as the streaming service does not work.

This only affects iPad. I have multiple iPads and they all do the same. Then iPads are all iPad Pro 10.5”

It works perfect on iPhone 6smax iPhone XS Max and iPhone 11 Pro Max and macOS

If I install the YouTube app on the iPad then I can airplay to the Apple TV.

Why do I have to install YouTube app to airplay to Apple TV?