KiFFERSTUEBCHEN

Well the title says it all.I have been playing on this server group since half a year and i find the command !repeatbuy or !rb is very convenient for me and other players to use it in whatever situation they are facing,but currently i cant use the command itself but when im dead/as a spectator i tried to type out the same command and it says u must be alive to use those command.
So when im alive ,i type those command and it din't work,nothing happens.
How to solve this problem? Thanks for reading.