I get the message:
You cannot trade with one who has shared your internet location, or with whom you or they have shared their account login.
I have done some reading of the forums and from what I have read using brokers is allowed between the two account (although direct send is not allowed).
Quote from a different thread (Its fairly old so it might not be valid anymore [Mon Dec 16, 2013 9:19 am] )
The relevant part is highlighted in red.
Any more info needed just ask,Juliette wrote:If you have a multi, you will get banned.
I take it you are talking about an NG-Main, and are confused about how to call it.
You can broker between them without any complications. Direct send works mostly only from your NG-Main to your regular Main.
(Also confused about where to put the question, possibly. This is not a Newgrounds question, since you are doing your deeds on Main. Moved -> Newbie/FAQ)
Thanks