Minecraft version: 1.19.4
Modloader: Fabric
Fabric loader version: 0.14.19
Environment: Multiplayer

Mod name: Beautified Chat [Client]
Mod version: 2.2

Chat mod does not work on servers, only in single player.

Do you have the mod installed on the client only or do you also have Beautified Chat [Server] installed server-side?

Do you have the mod installed on the client only or do you also have Beautified Chat [Server] installed server-side?

Just the client.

This needs to be installed on server side as well

Was this ever resolved? The description of the mod says "This is the client variant of the Beautified Chat mod. It is highly configurable and allows users to change the chat input on their client. The mod variant you're currently looking at just needs the mod the client. It will make changes to the chat on all connected servers, without the need to have the mod on the server's mod list."

Unless I'm misunderstanding, it sounds like the mod is supposed to work regardless of if the server has the "Server" plugin installed