In my (thankfully limited) experience it was around responsibility and methods of escalation.

My read was that a team didn't want to be bothered with something, but I was working on a corporate priority, so we set a meeting, hashed out, and agreed on how issues should be brought to them.

When something happened down the road, the agreed process was followed, and they (surprisingly stubbornly) claimed they weren't responsible and shouldn't be contacted for this issue.

Typically scope of a project: feature x and y are agreed to not be included but two sprints before release they become a must have, because otherwise Sales suddenly cannot sell the product.