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if you use in extra.less, you need to use variable: .m-faContent(@fa-var-arrow-up)
All variables you can find this: setup_fa.less
They correspond to the names of the icons.
In general, it is advisable to use built-in tools
Instead of content, specify this type and if you need to connect icons, use .m-faBase();, and if you need a certain type, then indicate which one you connect as an example .m-faBase('Brands');
You can just use this.
Result:
In this example, the built-in variables in the engine are used, and the name of the icon variable is taken from the template setup_fa.less