https://community.ruckuswireless.com/t5/SmartZone-and-Virtual-SmartZone/How-to-find-AP-s-admin-password-once-they-are-added-to-the/m-p/35096
By default, the default zone AP login credential will be the cluster name.
For example:Below we can see default zone has the username as vsze-195 by default and password should be vsze-195 by default(if we have not changed it)