Hi @atomique,
glad it helps. 
I forgot to mention that you have to create a Service Discovery rule prior. Here is what I have in one of my setups:
You can find it via Setup → Network interface and switch port discovery
The important setting is to use the interface description on the UniFi Access Points.
After you created the rule you have to rediscover the services and remove the vanished services and replace them with the new ones. In the end you should have a service name like this:
If you have VLANs in place you also get an interface service for that too. (In this example I redacted them)
This should solve your problem 
Greetings Norm