In order to add the Switch to the Unleashed Dashboard for monitoring it must be running the code 08090 minimum.
So please confirm you have a ICX7150 Ruckus Switch, because there are some Lennar houses with other brands, and that the Switch is not showing does not mean that is not working, just that is not associated, and you can not manage the Switch from Unleashed Dashboard is for monitoring and should appear in the IP scanner as long you are connected to the Switch via wire or wireless to the unleashed network.
Please try to gain access to the Switch via console and upgrade the Switch to the code 08095g, upgrading both partitions to the switching code file named SPS08095gufi.bin.
To check the current version of the switch you can use show version commands to confirm if your version is lower than 08080.
If the version is lower that the code 08080, you need to upgrade twice from the code using the Image file SPS08080f.bin and the boot file named spz10114.bin, the from 0808f to 08095g UFI using only the image file named SPS08095ufi.binfor both partition primary and secondary.
Please try to find the Switch IP address, by wiring the computer to the Switch(hope windows) use any of the yellow ports
How to remotely access to 'ICX 7150-12P' or 'access points' "Network devices"