Hi Prospect, glad you and your friends are here!
The trade blocking algorithm is something that we had to add due to multiple abuses. I am really unhappy about the side effect that it also means that legitimate users accessing from the same location are blocked from making trades, because I know that is a very engaging aspect of the game, especially when you know your trading partners outside of the game. It is unfortunately what we had to choose as the alternative can cause far greater damage to the integrity of the game, as I'm sure you can understand.
Even without being able to trade amongst your friends, though, I'm sure you will find there is plenty to engage with the competitive nature of this game - especially if you all managed to get in the same division or conference.
Again, I'm sorry for not being able to make an exception at this time, but it is unfortunately the nature of the way the system is set up to prevent abuse.
Thanks again for joining and I hope you have a great time!