Hope you are doing well !
Here is a guide with the most common usernames and passwords that are preconfigured, you can try "is key sensitive"
username:admin password: Lennar
Most common Setups for Lennar homes users
If none of the usernames/passwords work, do a factory reset on one of the access points, but disconnect the rest of the access point from the "ICX-7150", for example, if you have 3 access points, you should go to the switch and disconnect 2 of the cables to turn off the "2 access points" and only leave 1 connected with which we are going to work the factory reset.
Here is a guide how to Factory reset and configured correctly:
Physical Factory Reset an Access Points Ruckus:
Ruckus Unleashed Set-up using your Mobile: