I think the lecturer might have set the player count back to 1?
If you have your play settings still set to 2 players, then both instances of the game (the server and the client) will notice the overlap event and dump into the same output log.
To fix wrap the UE_LOG in if(HasAuthority())
if (HasAuthority())
{
UE_LOG(LogTemp, Warning, TEXT("Activated"));
}
Thankyou to Lennart in the Q/A