ssh root@192.168.1.10
 
otherwise, try
 
ssh ubnt@192.168.1.10
ubnt@192.168.1.10's password: 

returns:

Linux UCKG2 3.18.44-ui-qcom #1 SMP Mon Aug 1 14:28:39 CST 2022 aarch64
 
Firmware version: v2.5.11
                .--.__                              ________
  ______ __ .--(    ) )-.   __ __                  |        |
 |      |  (._____.__.___)_|  |  |__ _____ __ __   |___|    |
 |   ---|  ||  _  |  |  |  _  |    <|  -__|  |  |   /    ___|
 |______|__||_____|_____|_____|__|__|_____|___  |  |        |
        (c) 2022 Ubiquiti Inc.            |_____|  |________|
 
      Welcome to the CloudKey G2!
 
********************************* NOTICE **********************************
* By logging in to, accessing, or using any Ubiquiti product, you are     *
* signifying that you have read our Terms of Service (ToS) and End User   *
* License Agreement (EULA), understand their terms, and agree to be       *
* fully bound to them. The use of CLI (Command Line Interface) can        *
* potentially harm Ubiquiti devices and result in lost access to them and *
* their data. By proceeding, you acknowledge that the use of CLI to       *
* modify device(s) outside of their normal operational scope, or in any   *
* manner inconsistent with the ToS or EULA, will permanently and          *
* irrevocably void any applicable warranty.                               *
***************************************************************************
 
Last login: Mon Oct  3 00:16:55 2022 from 192.168.1.69
root@UCKG2:~#