What is complaining?
Bear in mind that a lot of the default warnings and errors that come from VS do not apply. If you have a successful compile, you are good.
Intellisense is particularly bad with FStructs; the first property in an FStruct often doesn’t appear in intellisense at all. If you’re just getting the squiggly lines and intellisense warnings, you can ignore them. The only thing that matters is if it compiles.
Use the output tab, do not use the Error tab in VS to evaluate compile results. UE4 uses so many macros VS often gives misleading error messages.