It's on the same branch of I1 as the unusually Pomeranian I1*-P1 and I1*-P2 branches, as well as the Welsh outlier branch called AS4, all of which are suspected of being outside the Germanic spread that is normally associated with I1, although the apparently Germanic ML branch is also there with them, indicating that they probably didn't stray too far from the Germanic core.
I'm not sure we know enough yet about I1-M227 to be entirely sure about it, but it looks promising to have expanded from east of the Germanic core area. As with all I1, we'll need to stay geographically to the North in our analysis of where it launched from. Since it currently has a distribution from Ukraine to Sweden, and into Lithuania, my best guess right now is a connection with what is now northern Poland. Nordtvedt gives it a TMRCA of 3000 YBP. I'm not sure yet what populations match that pattern.