Unable to set 'management-ip' on interface - FGT600E 6.2.3

I have a FGT 200D running 6.0 and have used the 'set management-ip' command there to specify a local (non-syncd) IP address so that each unit in the cluster can be directly managed/monitored.

Just got a new FGT 600E and am unable to apply the same command. It's not showing up in full output as an option, or using command completion. Checking the CLI reference log it shows as valid command for 6.2.

https://docs.fortinet.com/document/fortigate/6.2.6/cli-reference/10620/system-interface

Is there a pre-req before I can apply this command 6.2?