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@Najib Akbari although the code is deferred due to FN74383 the cnssdaemon.log bug does not apply to these APs running IOS so I wouldn't be too concerned about that specifically in this context. APSP4 (which you have installed) has the 2 main bug fix...
@24680 didn't you change it to static IP configuration?If it's using a static IP then you would not expect to see it in the DHCP leases.If you can't remember the IP you configured you can always login on the console to check what it's using.
@Rahul Wankhade why specifically 17.15.4d?
The current recommended release for both 9300/9500 and EWLC is 17.15.5 not 17.15.4d:https://www.cisco.com/c/en/us/support/docs/switches/catalyst-9300-series-switches/214814-recommended-releases-for-catalyst-...
@hellencharless54 it was established very early on that this is Mobility Express so asking the original poster to confirm that is utterly pointless. If you had read and understood the previous posts you would have known this! Pasting in another cha...