I can try to replicate your issue when I get home today and figure out what you need to do to solve this. UE 4.9 is a lot different from UE 4.27, and I’m not sure why they keep tutorials as old as this one, as they’ll be deprecated.
I found more recent tutorial: UE4 C++ Tutorial - How To Move Pawns - Pawn Movement - UE4 / Unreal Engine 4 Intro to C++ - YouTube
I havn’t watched this video, but DevEnabled is a good tutor.