It is completely NORMAL for a transition team to discuss events and outcomes with foreign powers.
“In fact, the Russians agreed to change their tactics at the UN because of an agreement with Flynn and his Trump contacts, before Trump was sworn in, that’s against the law, the Logan Act.”
Andy McCarthy disagrees with you:
“There was nothing wrong with the incoming national-security adviser’s having meetings with foreign counterparts or discussing such matters as the sanctions in those meetings....That, however, is exactly the sort of thing the incoming national-security adviser is supposed to do in a transition phase between administrations.”
Read more at: http://www.nationalreview.com/article/454269/michael-flynn-plea-no-breakthrough-russia-investigation
Yes and no.
The problem for Flynn, is that action was taken by the Russians as a result of his request.
When you agree with a foreign agent and action is taken, action that is contrary to US policy, you violate the Logan Act.
Had the Russians not acted until Trump was President, no harm, no foul.
All of this is about timing.