Completely lost on movement replication

I’ve been trying to replicate movement on my characters as well as spaceships pawns, but with no success. The characters can see each other walking around, but they also have jetpacks, which change the velocity of the character. Now I’ve tried ‘Run on Server’ with and without a ‘Multicast’ event after that and also tried to place the logic in the player controller, but nothing seems to work. I also thought, since the walking works and its done via AddMovementInput, I should try using that, but that also failed…

I’m really out of ideas and would love, if someone could point me in the right direction, apparently I dont understand how replication works :frowning:
If there’s anything I can provide, let me know!