OK. So all devices are on the same subnet. Good.
Have you recently updated your Mac running your Roon Server to Sequoia 15? If so there are a number of posts on the forum already where people have had issues with the update changing the MAC security and firewall settings rendering Roon non functional in a manner similar to this.
If you have, then you should do a search on the forum for “Sequoia”. E.g.
https://community.roonlabs.com/search?q=Sequoia%20order%3Alatest
For example, I found this post:
Beyond this, I’m afraid that I am unable to help as I don’t use either Apple devices or Ropieee. Sorry.