Apple Remote won't connect to Music library after upgrade to Big Sur 11.4
We have two iPhone 12 Pro Max phones, and only just today upgraded to iOS14.6. My iMac Pro was running Big Sur 11.2 until last week, and after the update the Apple Remote no longer connects to the Music library using manual settings. It says "Connecting to library" with the spinning icon, and the screen goes to sleep before it can find the system. I can enter the code to the Music app on the iMac, and the iPhone acts like it's connecting, but nothing happens.
I've rebooted the iMac, the router, the phones, still the same. I've removed and reinstalled the app, still no connection. Home Sharing does not connect, either. I realize the Remote app has not been updated in a great while, but am I just sort of out of luck on this one?
iMac Pro, macOS 11.4