In that case, you’ve done everything that can be done on your part. If the Varèse still doesn’t show up on Audirvana, @Phil and @AndrewS need to come to your rescue to get it sorted 
I think this is a UPnP problem not just Audirvana. I am running Minimserver but Mosaic doesn’t see that. Before it showed up in Mosaic as soon as I started the server. Frustrating!
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If you are using iOS then grab the free version of 8Player and that is able to find SMB shares and UPnP servers on your network - see if that sees your Minimserver?
There’s nothing changed in either the Varese or Mosaic ACTUS as far as UPnP discovery is concerned so my suspicion would be that there is (as has been suggested by @Anupc earlier) an issue with Multicast traffic being broadcast around your network.
I HAVE had issues with this happening with NetGear Orbi kit before but that was a very long time (several years) ago and as far as I am aware those issues should have been resolved so I’m somewhat surprised that swapping to newer kit has introduced this issue … unfortunately it’s almost impossible to remotely diagnose these consumer level mesh systems as a full setup and generally my suggestion would be to break the system down into its simplest possible setup and then add to it.
So, although I realise it is a total pain to do, I’d pull the router, power down every WiFi extender, set the router up with just the Varese, Minimserver and Audirvana PC connected to it by WIRED connections and confirm that UPnP works there, then from there add back in devices until things stop working and that will usually give you a way to finding out what is breaking stuff.
Ultimately, as @Anupc has already mentioned, consumer grade mesh networking kit really isn’t at a point yet where it is reliable enough to confidently use as a solution - which is why we always recommend against these solutions and why as a first port of call when diagnosing issues I’ll ask exactly what is between the dCS kit and the router and ask for the kit to be directly connected back to the router and any WiFi Extenders turned off. The general level of support that you’ll get from the manufacturers on this consumer grade kit will normally be essentially a couple of questions about how it is set up and then a not very helpful “in that case box it back up and return it for a refund” but then again WiFi is totally at the mercy of the local environment and there just isn’t the meat on the bones of those products (nor the configuration ability) to allow for much in the way of faultfinding and resolution… 
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@Phil you might have missed this;
John doesn’t elaborate on the Switch brand/model (which might have some significance to the issue he’s facing). But generally, sitting on the same layer 2 Switch, Audirvana should have no difficulty locating the Varèse under normal circumstances I’d imagine.
@demoleon
John, by the way, did you ensure Audirvana has network access permission under MacOS? First time you ran Audirvana, MacOS would have prompted you to give it local network access. Else, you can always enable it manually;
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New wrinkle on this problem. I installed VLC Media Player on the Mac and iPhone and it can see both Minimserver and AssetUpnP and browse them both. But Mosaic can’t, either on the Mac or iPhone. Any ideas?
I think that the answer is already in this thread. I cannot remember any Mosaic discovery issue where the answer has not related to the network and its configuration. That VLC can see both and Mosaic cannot is because VLC and Mosaic may use different discovery methods. As previously remarked it is likley that something is preventing multicast traffic which affects one and not the other.
The only way to discover where the solution lies is as per Phil’s suggestion:
i.e. start from the simplest setup and add items like mesh units until it breaks. Yes it is a PITA to do.
Well, the plot thickens. Last night as I was messing around, starting and stopping servers and trying various clients, Mosaic Actus found AssetUPnP (but still not Minimserver). It was short lived however. When I went back into Mosaic it said (and still says each time I load it) in red at the bottom “Could not load unknown upnp server”. I did download 8Player and it can see both AssetUPnp and Minimserver right away no problem.
That other players can see the UPnP servers but Mosaic cannot does not indicate that Mosaic is faulty. It just indicates that your network is blocking the multicast traffic that Mosaic requires.
So you can carry on finding other products that do work as they do not require this feature. However this will not aid you in solving your issue with Mosaic Actus. You will have to find what in your network is blocking this and fix it. I am afraid that there is no magic wand.
What does Mosaic Actus require that other clients don’t? Might give me a start as to where to look in the router setup. Still strange that it could see AssetUPnP briefly. I’m not going to put too much more time into this as my trial to Audirvana expired and Varese doesn’t work with Varese yet. Hopefully dCS will have a firmware update to fix that (and Qobuz Connect) and I’ll revisit.
It requires multicast data packets.
I think that you mean Varese does not work with Mosaic Actus control point. There is no requirement for a dCS firmware fix as there is nothing wrong. The solution will be found by finding what in your network is preventing this feature functioning.
8 days ago Phil told you what steps to take but nothing that you have written since suggests that you have followed his advice.
John, that indicates your networking setup, at lest from your Mac/iPhone connections, is working as it should, as are your UPnP Servers, and your MacOS security settings. VLC is a well trusted application for testing multicast.
I’m not sure how Mosaic ACTUS operates exactly, but with the standard Mosaic, similar challenges with discovering UPnP Servers have been noted elsewhere.
The following recent thread is an example, and I do recommend you read it in full;
One key aspect to note is the point I raised about how the UPnP Servers are actually initially discovered on the network, by the dCS hardware, not actually Mosaic (on your Mac/iPhone);
In any case, my suggestion is to let @Phil assist you in getting this resolved.
Sorry Pete, that’s incorrect. Every UPnP Control-Point uses the same method to discover UPnP Servers (via SSDP).
As I mentioned in the past, it’s other applications that use different multicast techniques for discovery, for example, how Roon discovers its Servers is different from how the Qobuz App discovers Qobuz Connect capable hardware, versus how Mosaic itself discovers dCS equipment on the network etc. They all rely on multicast, but differently.
Things get slightly more complicated with Mosaic because in some sense it’s not a pure-play Control-Point, it’s actually a hybrid graphical front-end to everything that the Mosaic Processor does, ie. the dCS network connected hardware (and firmware).