Welcome to the Forum.
I believe you changed Sync 2 to Sync 3 if I understand your post.
Anytime you have to modify a connector, I think it means that the kit likely didn't have the correct wiring.
I have read a lot about people wanting to swap from SYNC2(MFT) to SYNC3 in their Explorers. Everyone says Ford should have put SYNC3 in the 2016 model year. There was lots of grumbling that it was produced with SYNC2. There was a rumor that SYNC3 was tested in a 2016 by Ford but they couldn't...
www.explorerforum.com
Peter