rkscli is only available for TAC and Engineering access, it's restricted to customer's acces; you could contact support and ask them they can run the command for you and provide you the required information.
But the Data sheet's don't provide you details about what your AP is actually TX at. only gives stats that the engineers think the AP's will performat. Why would the command iwconfig be limited to only engineers and TAC. This command should be part of basic cli access as its necessary to be able to tell what dB your AP is transmitting at basic troubleshooting level. Should not have to contact support and create a case for such a simple command access. Poor support and programming.