How do you private chat someone with multiple words in their name? Every time I try it catches the first word only and then says not found.
Have you "tried enclosing it in quotation marks"? For some odd reason, most software doesn't know how to deal with " " space characters, and treats a space like the end of the universe, but seems to be able to handle them when enclosed in quote.
If it follows the same logic they use in the console commands then you might try single quotation marks around the name. Like this 'The Name' For commands it is anyways single quotation marks (') and not double quotation marks("). I don't know if chat follows the same logic or not though.