Can't execute on server

[GameExp (GameExpF)]

When I’m trying to use the “Executes On Server” event after interacting with an object on the client-side.

Interaction blueprint
Debugging shows that it’s being skipped (“Using for Server” on the picture above.)

Server event
How can I fix it?

PS: I’ve already tried to use the “Switch Has Authority” node with a second custom event with “Executes On All” replication.

[Tuerer]

What is this blueprint class?
Not all classes can call server functions. E.g. Player Controllers and possessed Characters can, but regular actors cannot.

[GameExp (GameExpF)]

Yep, that’s an actor. What should I do to change this variable on the server from the client?

[Tuerer]

If you interact with it from the Character BP or the Controller BP, you can call the server function directly.