Skin add command not working

Hello. The command /skin add shortname id is not working for me. It always retrieves the skins help menu. I have tried it ingame and rcon and same thing happens. Am i doing something wrong or is in fact not working at the moment?

Thank you

Show exactly what you are running

I have tried on rcon and ingame /skin add metal.facemask 2810942233 (rcon without /) for example and both show list of commands. 

(00:47:16) | Command usage:

skin show - Show skins

skin get - Get Skin ID of the item

(00:47:16) | Admin command usage:

skin show - Show skins

skin get - Get Skin ID of the item

skin remove (Shortname) (Skin ID) - Remove a skin

skin add (Shortname) (Skin ID) - Add a skin

 

 

any errors etc

None. Only what i posted. Exactly like doing the help command.