Controllerless Networks

Hello,
I'm totally new to Aruba products, we have 6 access points in our building at work (model: APIN0505) , they were making 2 clusters (3 devices for each cluster),
one cluster of them recently had only 2 APs, so there is an AP that went rouge and I can't find its IP (but still working fine), it's like a ghost,

The 6 of them are connected to Aruba switches, dynamic IPs in all network, I tried searching the switches' GUI for any connected IPs, but none found..

how can I find that lost one's IP to log onto it using WebUI?

you can check the VC of the cluster that the missing AP was part of, and login to it and see the alert icon on top right corner

then check teh active fault tab, where you can find the MAC addr of the missing AP

once you know that,  if the missing AP is connected to the LAN switch, then it should show up in the MAC table.

check the mac table of the LAN switch for it and it will give you which port it is connected to.

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If my post was useful accept solution and/or give kudos.
Any opinions expressed here are solely my own and not necessarily that of HPE or Aruba.
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If you know the mac-address of the AP, you can search the magnifying glass to identify your IP.