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SG300 not authenticated in Configuration Assistant

Hello, I am fairly new to the Cisco Switches and just recently received an SG300-28, I have changed it to L3 and setup the IP along with 3 LAGS and everything is working great, I am currently setting up 3 SG300-10P that will connect to the 28 and was hoping to use the Configuration Assistant but the switches will not Authenticate.  It eventually finds the main switch but always asks for as username and password for the "REALM ADMIN" which I am not sure what that is and then it says it can't Authenticate.  I have enabled Telnet and SSH but I am thinking I may have something set wrong or missed something.  I can Telnet into the switch and see the config and change the config but still no luck.

Any help would be appreciatted.              

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