Just to add some detail. I updated all the software, rebooted the router and even reinstalled Roon after deleting it and cleaning up the Library folder on the Mac book pro. Nothing is working, not sure why the app won’t connect, though I can get to the roon rock on the browser and on the iPhone it connects without issue? When I rebooted the server the app would see the server for a minute and not connect then it disappears.
Finally got it to work again. I deleted everything and erased the Library folder by command line rather than just putting it in the trash in Finder using -rm -rf ./Roon. Reinstalled it a third time and it finally worked.