How do I use an enum with a switch statement?

Enum is represented as integer numbers, so you can just use 0,1,2,3… for case conditions.

enum class EVictoryEnum : uint8

or you can use

enum::value

as condition

Here is more detailed explanation:
https://wiki.unrealengine.com/Enums_For_Both_C%2B%2B_and_BP

Hope it helps.

Regards,
Alex.