Players are chatting with each other, can see in game and in concole too. But cannot see in RCOn chat tab. 
I can only see automated mesage in chat. 
Plugins used 
NoGiveNotice
TimedExecute
SystemNotifications
radar

rcon chat is iffy depending upon which rcon you use.

There is a few diff options for piping the server chat to a discord admin channel and that works very well.
Search umod here for: Discord