I also noticed this noise shortly after purchasing my 2017. Much like you I researched it and discovered it’s normal. It’s frequently blamed on the direct injection fuel pump.
My vehicle has been at the dealer for repairs a lot. I ended up switching dealers because the first one always seemed to hand me back my vehicle with a new problem. When I arrived at the second dealer I explained all the trouble I had been having and asked them to fix a number of things along with general direction to fix anything else it needs because, let’s be honest, I’m not a Ford mechanic and never will be so they ought to know best. Anyway, long story short, a number of repairs were made, including a driver side turbo, but this clicking was never mentioned by them as being a problem. It’s been back since for oil changes and a couple other non-powertrain things and it still hasn’t come up.
I should mention that I understand many people don’t trust the dealer or any shop for that matter, my self included, but this is one of two shops that have earned my trust. The other is a Toyota shop my family has used for the Toyota vehicles we’ve owned. The point of all this is to say that I trust if this was an issue that my ford dealer would have dealt with it.
Hope that makes you feel better!
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