No.
It would obviously be nice if they were open to working on your relationship together.
However, I typically work with people who are at a very tough point in their relationship where they are going through a breakup, their partner may barely even speak to them, and they certainly wouldn’t be open to the idea of "working on the relationship.”
The strategies in Effortless Connection are intended to help you and your partner overcome your differences and connect with just you working on the relationship yourself.
As things get better, you can recruit your partner into working on things if you like to, but it is not required for this corse.