If you spot something in one of our books that you think might be an error, please let us know here on Twitter The section on half-orcs says humans and full orcs can't have the Mark of Finding, but the section on humans and the section on the Mark itself both say they can.
— Jake Nelson (@jakejnelson) November 21, 2019
That's on the fix list.
— Jeremy Crawford (@JeremyECrawford) November 21, 2019
The Mark of Finding game feature is correct. It works for both humans and half-orcs.
— Jeremy Crawford (@JeremyECrawford) November 21, 2019