Hello @Kai-Mikael Jää-Aro ,
Could you please change the debugging and building platform to x64 , not x32.
Please take a look at these similar Github issues:
Body Tracking Samples Visual Studio's error Code LNK2019: Unresolved external symbol.
Using Body Tracking functions won't compile.
Please let us know if you need further help in this matter.
Please accept helpful responses as 'Answer', which will be helpful to others as well with similar question.