The console and other internal editor features are only available for some partnered creators with Epic.
It is not available to public builds of UEFN for all creators, sorry :(
There’s an effort to bridge this functionality gap with debug commands.
I think the console may be disabled in-editor for security concerns, also Fortnite is probably packaged in ‘shipping’ configuration, which strips out the console. (When packaging in UE you have options for different configurations)