Home sharing not working with Windows, does work with with Catalina
I have home sharing turned on with the TV app under Catalina enabled on a MacBook, and it can be seen from my Apple TV. So the Apple TV and the network are fine.
However, iTunes home sharing on a Windows 10 machine does not work (the Windows machine library is not listed in the Apple TV Computer app).
On the Windows machine, the firewall is turned off. iTunes is authorized using the same account as the MacBook. Home sharing is turned on in iTunes using the same account as the MacBook. The Bonjour service is up and running. I can access UDP port 5353 from another computer. IPv6 is disabled on the Windows machine.
Is there anything else I should be checking?