Rotate a static mesh : Client pass trough mesh

Hello,

I’m rotating a mesh like a platform, it’s a ring of clouds as one mesh, but when the client want to climb on it, he just goes trough the mesh and fall.

If i plug a switch has authority node after begin play, it works but now the movement on the mesh is choppy like it has 10fps…

Everything is good server side though.

ANyone has an idea ?
Thanks