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I'm the Tech director for a high school that uses an all Meraki network. When we try to screen mirror using a Chrome browser cast, the Chromecast device (Chromecast with Google TV - gen 4) we want to mirror to says "Available for specific video sites...
Still none the wiser. The old gen chromecasts still work most of the time (occasionally they will disappear for a while and come back). Though I haven't even tried the newer version for several months, so who knows.
I also do IT for a private high school and have the exact same issue. Gen 2/3 chromecast works fine, but gen 4 chromecast with Google TV gets the "Available for specific video sites" message and not able to select it to cast to it. I took it home and...