I would like to discuss a task similar to “The next step falls between responsibilities.”

A possible distinction: Departments disagree about what should happen first.

Possible first output: An agreed sequence of work with reasons for the priorities and explicitly deferred tasks.

I would like to check whether this first step fits our task and discuss terms for further work.

Our situation: [add details]
What we want to change: [add details]
What we have tried: [add details]